The Phelsuma laticauda, commonly known as the gold dust day gecko, is a small, brightly colored lizard native to Madagascar and nearby islands. It is easily recognizable by its vibrant green color, often adorned with golden or red spots on its back. Its size typically ranges from 10 to 15 cm, including the tail. This gecko is diurnal, meaning it is active during the day, and is often seen on tree trunks or the walls of human dwellings. It primarily feeds on insects but also enjoys nectar and fruits. Its ability to adapt to various environments, including urban areas, makes it a fascinating example of animal adaptation.

The Gemsbok is a large, sturdy antelope native to the arid regions of Southern Africa. It stands between 1.2 and 1.5 meters at the withers and weighs between 200 and 250 kg. Its coat is primarily gray or beige, with white markings on the belly, legs, and face, giving it a distinctive appearance. It has long, straight horns, which can reach up to 1 meter in length, and are characteristic of the species. The Gemsbok inhabits savannas, steppes, and deserts, where it feeds primarily on herbaceous plants, roots, and fruits. It is well adapted to extreme heat and drought conditions, thanks to its ability to reduce its body temperature and feed on sparse vegetation. While the Gemsbok is capable of surviving in desert environments, it is also able to travel long distances in search of food and water. The species is not currently endangered, but it faces threats related to habitat loss and hunting.

The Gerenuk is a unique species of antelope from East Africa, recognizable by its long neck and graceful posture. It lives in savannas and semi-deserts, where it primarily feeds on shrubs and tree leaves. The Gerenuk is an excellent climber, capable of standing on its hind legs to reach high vegetation. This ability allows it to feed efficiently and avoid competition with other ground-dwelling herbivores. Although relatively discreet, the Gerenuk is threatened by habitat loss and poaching.

Gibbons, members of the Hylobatidae family, are primates particularly known for their agility and their ability to move through the canopy. They are the smallest of the great apes, measuring between 40 and 70 cm in height, with long, powerful arms that can reach up to 2.5 times the length of their body. Their weight typically ranges from 5 to 15 kg, depending on the species. Gibbons are primarily known for their mode of locomotion called "brachiation," where they move by swinging from branch to branch at impressive speeds, often at high altitudes. Their fur is typically dense, varying in color from black to light brown, and some species have distinct facial markings. Gibbons primarily inhabit the tropical forests of Southeast Asia, where they feed mainly on fruits, leaves, and small insects. These primates are social and typically live in small family groups. While gibbons are not all at immediate risk, several species are endangered due to habitat loss, poaching, and the illegal wildlife trade.

The Glaucous Gull is a large seabird, easily recognizable by its imposing size and distinctive plumage. It measures between 60 and 70 cm in length, with a wingspan of 140 to 150 cm, and weighs between 1.2 and 2.5 kg. Its plumage is primarily white, with light gray wings and black markings on the tips of the feathers. The head and beak are generally yellow, with a red band on the beak. This gull is an excellent swimmer and an opportunistic hunter, feeding mainly on fish, crustaceans, and human waste when near urban areas or ports. The Glaucous Gull primarily inhabits coastal regions of the Arctic and North Atlantic and is well adapted to cold, marine environments. Although it is not endangered, it faces risks related to pollution, habitat loss, and human disturbances.

The Great Black-backed Gull, Larus marinus, is the largest gull, with an impressive wingspan of up to 1.7 meters. Its plumage is mainly white with a black back, and it has pink legs. Found primarily along the North Atlantic coasts, it feeds on fish, smaller birds, and carrion. Opportunistic, it often ventures into ports and landfills for food. Although often solitary, it can be seen in groups during nesting. Its call is loud and harsh, typical of gulls. During the breeding season, it builds its nest on cliffs or rocky islands, usually laying three eggs.

The Great Green Macaw is a large, colorful, and majestic parrot known for its vibrant green plumage, with touches of blue, yellow, and red on the wings and face. It measures about 85 to 95 cm in length, with a wingspan of 1.2 to 1.4 meters, and weighs between 900 and 1,200 g. Its dominant green plumage is complemented by blue feathers on the wings and red around the face and chest. The Great Green Macaw primarily inhabits the tropical rainforests of Central and South America, notably in Colombia, Venezuela, Panama, Costa Rica, and Nicaragua. It feeds mainly on fruits, nuts, seeds, and flowers. This parrot is highly social and typically lives in family or small groups, but can also be seen in large flocks in its natural habitat. Although the Great Green Macaw is not yet immediately endangered, it faces threats such as habitat loss, illegal wildlife trade, and deforestation.

The Macrotis lagotis, commonly known as the greater bilby, is a nocturnal marsupial native to Australia. Recognizable by its large rabbit-like ears, it has a blue-grey coat and a black and white tail. Adapted to arid environments, it digs deep burrows to protect itself from predators and extreme temperatures. An omnivore, it primarily feeds on insects, seeds, and fungi. Unfortunately, the greater bilby is endangered due to habitat loss and predation by introduced species such as foxes and cats. Conservation efforts are underway to protect this iconic species of the Australian ecosystem.

The great cormorant is a large waterbird found across much of Europe, Asia, and North Africa. It is easily recognized by its glossy black plumage, long neck, and sharp, pointed beak. This cormorant primarily feeds on fish, which it catches by diving into the water, using its diving technique to capture prey underwater. The great cormorant is also an excellent swimmer and powerful flier.

The Greater Kudu is an elegant, large antelope, easily recognized by its long, slender legs, streamlined body, and impressive spiral-shaped horns. It stands between 1.3 and 1.6 meters at the withers, with males weighing between 190 and 270 kg, and females weighing between 120 and 180 kg. Its coat is light gray to brown, with vertical white stripes on the body, which help it blend into forests and savannas. Males have long, spiral-shaped horns that can reach up to 1.5 meters in length, while females lack horns. The Greater Kudu primarily inhabits open forests, wooded areas, and savannas of sub-Saharan Africa, notably in East and Southern Africa. Herbivorous, it feeds mainly on leaves, bark, and fruits. This antelope is rather discreet and shy, typically living alone or in small family groups. While it is not currently in immediate danger, the Greater Kudu is threatened by habitat loss and hunting.

The Great Skua is a large, powerful seabird, belonging to the Stercorariidae family. It measures about 50 to 60 cm in length, with a wingspan of 120 to 130 cm, and weighs between 500 and 1,000 g. Its plumage is primarily brown and gray, with white markings on the wings and a generally dark head. The Great Skua is a migratory bird, found mainly in the coastal regions of the North Atlantic, particularly in Northern Europe, Iceland, Greenland, and parts of Canada. It is especially known for its piratical behavior, stealing food from other seabirds, such as gulls or fishing birds, by chasing them and forcing them to abandon their catch. While territorial, it is also an excellent swimmer and diver, feeding mainly on fish and crustaceans. The Great Skua is vulnerable to the loss of its coastal habitat and human disturbances, including pollution and disruptions caused by tourism.

The greater mouse-eared bat is a medium-sized bat, 7–9 cm in body length, with a 35–43 cm wingspan and weighing 20–40 g. Uniform grey-brown fur, long rounded ears. A cave-dwelling species, forages on the ground and in low flight for beetles and other invertebrates.

The Great White Pelican, or Pelecanus onocrotalus, is a large aquatic bird easily recognizable by its bright white plumage and long, voluminous bill with an expandable pouch. It primarily inhabits freshwater lakes and marshes, but can also be found in estuaries and coastal lagoons. This gregarious bird is often seen in large groups, flying in formation or resting on shores. It feeds mainly on fish, which it catches by dipping its bill into the water. Its collective fishing technique is fascinating, as several individuals form a circle to trap fish. The Great White Pelican is a symbol of cooperation and harmony in nature.

The Great Horned Owl is a large nocturnal raptor, one of the most imposing owls on the American continent. It measures between 50 and 70 cm in length, with a wingspan of 1.2 to 1.5 meters, and weighs between 1.5 and 2.5 kg. Its plumage is mainly brown, speckled with black, with lighter markings on its belly and wings. It has large tufts of feathers on its head that resemble ears, and piercing yellow eyes. This owl inhabits a variety of habitats, including forests, wooded areas, and open landscapes across North America, notably in the United States, Canada, and Central America. It is primarily nocturnal and carnivorous, feeding on small mammals, birds, and occasionally reptiles. It is also known for its impressive hunting abilities, flying silently to surprise its prey. Although the Great Horned Owl is not currently threatened, it may be affected by habitat loss and human disturbance.

The Great Egret is a large wading bird, easily recognizable by its entirely white plumage, long legs, and long, sinuous neck. It stands about 85 to 105 cm tall, with a wingspan of 1.3 to 1.7 meters, and weighs between 800 and 1,500 g. The Great Egret has a long, slender yellow beak and bright green eyes. It primarily inhabits wetlands, marshes, estuaries, and lake shores in Europe, Africa, Asia, and the Americas. This bird is an excellent fisherman, feeding mainly on fish, crustaceans, and aquatic insects, which it captures by diving or slowly probing the water with its beak. During the breeding season, the Great Egret is known for its elegant courtship dances and its plumage adorned with long, delicate feathers, giving it a majestic appearance. While the species is not endangered, it is sometimes threatened by habitat loss and water pollution.

The Great Crested Grebe is the largest of the European grebes, measuring between 46 and 51 cm in length with a wingspan of 85 to 90 cm. In breeding plumage, it has a black crest, a reddish collar, and a long, pointed bill. In non-breeding plumage, it is more subdued, with a dark back and a light belly. It inhabits shallow lakes, ponds, and marshes, often surrounded by aquatic vegetation. It primarily feeds on fish, aquatic insects, and small crustaceans. Reproduction occurs in spring and summer, with a clutch of 3 to 6 eggs laid in a floating nest. The young, with black and white striped plumage, are often carried on the parents' backs. A partial migrant, it winters in the Mediterranean and warmer regions. Listed as Least Concern by the IUCN.

The Cochranella Frog is a fascinating amphibian species, known for its translucent skin that allows its internal organs to be visible. Unlike other glass frogs, its skin is slightly granular, which helps it camouflage better in the dense vegetation of its habitat. This frog lives in the humid tropical forests of Central America, mainly in Costa Rica and Panama, where it is found on leaves hanging above streams. Its small size, combined with its discreet behavior, makes it hard to spot. The eggs are laid on leaves above the water, and the tadpoles fall into the stream as they hatch. These frogs are primarily nocturnal and prefer to avoid human interaction.

The Glass Frog is a fascinating species of amphibian, known for its translucent skin that allows its internal organs to be visible. It typically measures between 2 and 3 cm long and is commonly found on leaves hanging above streams in the tropical rainforests of Central and South America. Its transparent skin serves as an excellent camouflage, helping it blend seamlessly into its environment. This frog’s ability to blend with the vegetation, combined with its small size, makes it hard to spot. Its eggs are laid on leaves above water, and the tadpoles fall into the water once they hatch. This species is nocturnal and somewhat shy, preferring to avoid human interaction.

The Goliath frog is the largest amphibian in the world, capable of measuring up to 32 cm in length and weighing over 3 kg. Native to the rivers and swamps of Cameroon and Gabon, it primarily feeds on insects, fish, and occasionally small mammals. Its large size and rough green skin make it a formidable predator, but it remains discreet and prefers to stay submerged in water. Although not critically endangered, the Goliath frog faces pressures due to habitat destruction.

The Grizzly Bear is a subspecies of the brown bear, imposing and robust, often considered one of the most powerful land predators in North America. It measures between 2 and 3 meters in length, with a shoulder height ranging from 1 to 1.5 meters, and weighs between 200 and 680 kg, with males generally being larger than females. Its fur is dense and can range from light to dark brown, sometimes with silver hues that give it a grizzled appearance. The Grizzly primarily inhabits forests, mountains, and prairie areas in North America, notably in Alaska, Canada, the Rocky Mountains, and U.S. national parks like Yellowstone. Omnivorous, it primarily feeds on berries, roots, fish, but also small mammals and sometimes animal carcasses. While feared due to its size and strength, the Grizzly is a shy animal and prefers to avoid human contact. The species is protected in many regions, although its population is still threatened by habitat loss, illegal hunting, and conflicts with humans.

The Grey Heron is a large wading bird, easily recognizable by its slender silhouette, long neck, and large legs. It stands about 90 cm tall, with a wingspan of 1.5 to 1.9 meters, and weighs between 1.5 and 2 kg. Its plumage is primarily gray, with white markings on the belly and underside of the wings, and a white head adorned with distinctive black feathers. It has a long, pointed yellow beak, adapted for capturing its prey, primarily fish, amphibians, insects, and occasionally small mammals. The Grey Heron inhabits wetlands, marshes, rivers, and lakes across Europe, Asia, and North Africa. It is an excellent hunter, patiently waiting by the water's edge to capture its prey with its beak. Although the species is not endangered, it can be vulnerable to water pollution, habitat loss, and human disturbance.

The Red-shouldered Hawk is a large bird of the Cracidae family, easily recognizable by its imposing plumage and its crest on the head. It measures about 75 to 90 cm in length, with a wingspan of 1.2 to 1.4 meters, and weighs between 2 and 3 kg. Its plumage is primarily brown, with lighter feathers on the belly and distinctive markings on the wings and back. Its head is adorned with a reddish crest, giving it a distinctive appearance. The Red-shouldered Hawk lives primarily in the tropical and subtropical forests of Venezuela, Colombia, and Panama. It is often found in mountainous regions, where it frequents wooded areas and rocky slopes. The Red-shouldered Hawk is primarily herbivorous, feeding on fruits, seeds, and leaves. It is a terrestrial bird, preferring to move by walking rather than flying. Although the species is not critically endangered, it is vulnerable to deforestation and loss of its natural habitat.

Native to the Galápagos Islands, the Galápagos land iguana is a unique species of iguana known for its large size and varying color from yellow to red. It primarily feeds on cactus, flowers, and succulents. The Galápagos land iguana is well adapted to its arid environment and is often seen basking in the sun. While relatively peaceful, this species is threatened by introduced predators and habitat loss.

The Green Iguana is a large herbivorous reptile, easily recognizable by its long and sturdy body, as well as its bright green coloration. It measures between 1.5 and 2 meters in length, including its tail, and can weigh between 4 and 5 kg. Its body is covered with large scales and plates, and it has a crest running down its back. Its vibrant green color, especially in young individuals, becomes duller with age. The Green Iguana primarily inhabits tropical forests, mangroves, and wooded areas in Central and South America, as well as parts of the Caribbean. This reptile is primarily herbivorous, feeding on leaves, fruits, flowers, and sometimes young shoots. The Green Iguana is an excellent climber and spends much of its time in trees or resting on branches. While it is a widespread species, it is threatened by deforestation, illegal collection for the wildlife trade, and habitat loss.

The Great Bowerbird, Chlamydera nuchalis, is a fascinating bird native to Australia, renowned for its unique courtship behavior. Males build elaborate bowers decorated with colorful objects to attract females. Their plumage is primarily gray-brown with a distinctive pink patch on the nape. These birds are mainly frugivorous but also consume insects and other small animals. They inhabit various environments, including open forests, savannas, and woodlands. Their song is varied and often mimics environmental sounds. Although their population is stable, deforestation poses a potential threat.

The Trachypithecus geei, or Gee's golden langur, is a rare and fascinating primate endemic to the border region between Bhutan and India. It is distinguished by its striking golden fur, giving it a unique and majestic appearance. This arboreal monkey primarily inhabits tropical and subtropical forests, where it feeds on leaves, fruits, and flowers. Golden langurs are social animals, living in family groups led by a dominant male. Unfortunately, this species is threatened by deforestation and habitat fragmentation, leading to a decline in its population. Conservation efforts are underway to protect this iconic animal and its natural environment.

The Greek Rock Lizard, Lacerta graeca, is a species endemic to the Balkan Peninsula, mainly found in Greece. It is characterized by its bright green coloration with black patterns on its back, allowing it to blend effectively into its natural habitat. This lizard prefers rocky areas and open meadows, where it can bask in the sun. It is diurnal and primarily feeds on insects and other small invertebrates. Although relatively tolerant of human presence, it remains cautious and quick to hide when threatened. Its breeding season extends from spring to summer, with a gestation period of about two months.

The Gray Wolf is a large carnivore, often considered the ancestor of all modern subspecies of wolves. It measures between 1.2 and 1.8 meters in length, with a tail of 30 to 50 cm, and weighs between 25 and 40 kg, though some individuals can reach 70 kg. Its coat is typically gray, but it can also include shades of white, brown, and black depending on the region and season. The Gray Wolf lives in a variety of habitats, from deep forests to tundra regions, and from mountains to plains. It is a social predator that lives in packs, cooperating with other members of its group to hunt prey such as deer, elk, bison, and other large mammals. The Gray Wolf plays an essential role in ecosystem balance by regulating herbivore populations. Although it is protected in many areas, it remains threatened by habitat loss, hunting, and conflicts with humans.

The giant otter (Pteronura brasiliensis) is a semi-aquatic mustelid measuring 1.5–1.8 m in length (including tail) and weighing 22–32 kg. It inhabits slow-moving rivers, marshes, and floodplain lakes in tropical South America from the Orinoco to the Amazon. Highly social, it lives in family groups of 4–20 individuals, digs riverbank dens, and uses loud vocalizations. A specialist carnivore, it hunts fish and crustaceans by diving, propelled by its powerful tail. Females give birth in the dry season (August–September), and group members reinforce bonds through mutual grooming.

The Golden-collared Manakin, Manacus vitellinus, is a small, brightly colored bird found in the tropical forests of Central America, particularly in Panama and Colombia. Males are easily recognized by their vivid yellow head contrasting with a black and green body, while females are more subdued in olive green tones. This manakin is famous for its spectacular courtship displays, where males perform complex dances to attract females. They are often seen in dense undergrowth, feeding primarily on fruits and insects. Although their habitat is threatened by deforestation, they are currently listed as Least Concern by the IUCN.