The Nile Crocodile is one of the most formidable and largest species of crocodiles, capable of reaching up to 5 meters in length. It primarily lives in rivers, lakes, and swamps in Africa and is an opportunistic predator, mainly hunting fish, birds, and mammals that approach the shores. This crocodile is also known for its territorial behavior, with males often dominating large aquatic areas. Its powerful body and rough skin allow it to blend into its environment, facilitating its stealthy hunting strategy. While primarily aquatic, the Nile Crocodile sometimes ventures onto land to bask in the sun.

The Saltwater crocodile is the largest of the crocodiles, reaching up to 7 meters in length. It lives in the saline and brackish waters of the coasts of Southeast Asia, northern Australia, and the islands of the Indian Ocean. A powerful predator, it primarily feeds on fish, birds, and mammals, including large prey such as buffaloes and even sharks. While it is often feared for its size and power, it remains discreet in shallow waters and mangrove swamps. Due to hunting and habitat loss, the Saltwater crocodile is classified as a vulnerable species.

The African dwarf crocodile is a small semi-aquatic crocodilian, measuring 1–1.5 m in length, with a robust body, broad head, and dark brown and black mottled skin. It inhabits forest swamps, slow-moving tributaries, and wetlands of West and Central Africa, feeding primarily on fish, crustaceans, and aquatic invertebrates. Solitary and crepuscular, it shelters in burrows or under tree roots.

The Cottonmouth, or Agkistrodon piscivorus, is a venomous semi-aquatic snake found primarily in the southeastern United States. It is recognizable by its triangular head and coloration that ranges from brown to black, often with lighter crossbands. This snake is well adapted to aquatic environments such as swamps, rivers, and lakes, but can also be found on land. It is known for its defensive behavior, widely opening its mouth to show the white interior, hence the name "cottonmouth". Although venomous, it generally only attacks if it feels threatened. Its bite can be dangerous to humans, requiring immediate medical attention.

The Rock Rattlesnake, or Crotalus lepidus, is a medium-sized venomous snake, typically measuring between 50 and 70 cm in length. It is characterized by its gray or brownish coloration, often marked with dark crossbands, allowing it to blend into its rocky environment. This snake is primarily found in the mountainous regions of the southwestern United States and northern Mexico. It prefers rocky and arid habitats, where it can easily hide. Although venomous, it is generally not aggressive towards humans and prefers to flee rather than bite.

The Sistrurus miliarius, commonly known as the pygmy rattlesnake, is a small venomous snake, typically measuring between 40 and 60 cm. It is recognizable by its varied coloration, ranging from gray to brown, with diamond-shaped or banded patterns. Its head is triangular, and it has a small rattle at the end of its tail, although this is often less noisy than that of other rattlesnakes. It is primarily found in the southeastern United States, inhabiting diverse environments such as pine forests, marshes, and grasslands. Although venomous, its bites are rarely fatal to humans but still require immediate medical attention.

The Whooper Swan, also known by the scientific name Cygnus cygnus, is a large species of swan that can reach a wingspan of 2 to 2.5 meters, making it one of the largest swans in Europe and Asia. Its plumage is entirely white, except for the bright orange skin covering its bill. The Whooper Swan is primarily a migratory bird that lives in wetlands, lakes, and marshes. It feeds mainly on aquatic plants, but can also consume seeds and roots. During the breeding season, the Whooper Swan prefers freshwater lakes and ponds, where it builds floating nests. The migration of the Whooper Swan is particularly notable, as it travels long distances between its breeding grounds in Northern Europe and its wintering areas in Western Europe, Central Asia, and China. While its status is currently stable, the Whooper Swan can be threatened by habitat loss due to the draining of wetlands and water pollution. It is also vulnerable to illegal hunting and human disturbances.

The Trumpeter Swan, Cygnus buccinator, is the largest swan in North America, renowned for its pure white plumage and long, elegant neck. It is distinguished by its black bill and dark eyes. Its powerful, resonant call, reminiscent of a trumpet, gives it its name. This majestic swan frequents lakes, marshes, and rivers, feeding primarily on aquatic plants. It is often seen in small family groups. Although its population was once threatened by hunting and habitat loss, conservation efforts have led to an increase in numbers. The Trumpeter Swan is a symbol of beauty and grace in aquatic ecosystems.

The mute swan is a large waterbird found in lakes, rivers, and ponds across Europe and Asia. It is easily recognized by its bright white plumage, long graceful neck, and the black knob on its beak. This bird is known for its majestic flight and territorial behavior, especially when protecting its territory or young. Mute swans primarily feed on aquatic vegetation but can also eat small invertebrates.

The Blue Dacnis, or Dacnis cayana, is a small, colorful bird found in the tropical forests of South America. Males display vibrant blue plumage with black wings and tail, while females are a more subdued green. Measuring about 12 to 13 cm, this bird is often seen in pairs or small groups. It primarily feeds on fruits, nectar, and insects, playing a role in pollination and seed dispersal. The Blue Dacnis is a diurnal bird, most active in the morning and late afternoon. It is known for its melodious song and aerial acrobatics when feeding in the canopy.

The Fallow Deer, also known by the scientific name Dama dama, is a medium-sized cervid native to Europe and Asia Minor. It stands between 90 and 120 cm tall at the withers and can weigh between 30 and 100 kg, depending on sex and environment. Its coat, usually brown or gray, is spotted with white during the summer season, helping it blend into its forest habitat. The Fallow Deer primarily inhabits forests and woodlands, where it feeds on a variety of vegetation, including grasses, leaves, fruits, and bark. It is also known for its habit of moving in herds, often forming separate groups of males or females. The Fallow Deer is a ruminant herbivore that is primarily active at dawn and dusk. Although it is mostly sedentary, it can travel long distances in search of food or new habitats. During the breeding season, males fight for females, producing characteristic sounds such as roars. This species is listed as of least concern, but it can be threatened by habitat loss and excessive hunting.

The White-fronted Damalisque is a medium-sized antelope, recognizable by its reddish-brown coat and the distinctive white band that crosses its forehead, which gives it its name. It stands between 1.30 and 1.50 meters tall at the withers and weighs between 50 and 70 kg. This mammal primarily inhabits open savannas, grasslands, and semi-desert areas, preferring open terrain where it can graze on grasses, leaves, and stems. It is well adapted to heat and drought, thanks to its short coat and behavior of seeking shade during the hottest parts of the day. The White-fronted Damalisque lives in small groups, often consisting of females and young, while adult males usually live alone or in small groups. It is mainly active in the morning and late afternoon, when it is easier to feed while avoiding the heat of the day. While the species is currently in good health, it faces threats such as illegal hunting, habitat loss due to human expansion, and competition with livestock for food resources.

The Common Damalisque is a medium-sized antelope, recognizable by its reddish-brown or gray-brown coat, with distinctive white markings on the legs and belly. It stands about 1.10 to 1.30 meters tall at the withers and weighs between 45 and 70 kg. This mammal primarily inhabits the savannas and open grasslands of East Africa, notably in Kenya, Tanzania, and Uganda. It mainly feeds on grasses and herbaceous plants but can also consume leaves and fruits when grass resources are limited. The Common Damalisque is known for its social behaviors, typically living in groups of females and young, while adult males are often solitary or form small groups. During the breeding season, males fight to defend their territory and access females. While it is currently listed as of least concern, the Common Damalisque faces threats such as habitat loss due to agriculture and urban expansion, as well as hunting for its meat and skin.

The rock hyrax, or Procavia capensis, is a small herbivorous mammal found in Africa and the Middle East. It resembles a large rodent but is more closely related to elephants. Measuring about 50 cm in length and weighing 4 to 5 kg, it has dense brown fur, rounded ears, and short legs. Rock hyraxes live in colonies and are often seen basking on rocks. They communicate through a variety of calls and have a complex social structure. Although primarily herbivorous, they may also consume insects. Their adaptation to rocky environments allows them to evade many predators.

The White-beaked Dolphin is a small cetacean from the Delphinidae family, easily recognizable by its white beak and distinctive markings on its body. It typically measures between 1.5 and 2.5 meters in length and weighs between 70 and 150 kg. This dolphin primarily inhabits the cold and temperate waters of the North Atlantic, particularly around Iceland, Greenland, and the North American coasts. It primarily feeds on fish and cephalopods, using group hunting techniques to capture its prey. The White-beaked Dolphin is often seen in small groups or families, and it is known for its complex social behaviors, including group play and acrobatic leaps. This dolphin has a lifespan of about 20 to 30 years in the wild. Although the species is not currently endangered, it faces threats from pollution, underwater noise, and ship collisions. Managing its marine habitats is crucial for the preservation of this species.

The Common Dolphin is a medium-sized cetacean, easily recognizable by its streamlined body and distinctive beak. It typically measures between 2 and 2.5 meters in length and weighs between 100 and 150 kg. This dolphin is widely distributed in temperate and tropical waters, particularly in the Mediterranean, the Atlantic, and the seas around Asia. The Common Dolphin primarily feeds on fish, cephalopods, and sometimes small crustaceans, hunting in highly coordinated groups. Its social structure is complex, with groups ranging from a few individuals to several hundred, depending on environmental conditions and the availability of food resources. It is also known for its acrobatic behaviors, such as jumping and group play, and is often seen following boats. While this species is not currently endangered, it faces threats from pollution, disturbances caused by human activities at sea, and bycatch in fishing nets.

Hector's dolphin is one of the smallest dolphin species in the world, with an average size of 1.2 to 1.5 meters. It primarily inhabits shallow coastal waters of New Zealand, where it feeds on fish and squid. This dolphin is recognizable by its small, compact body, rounded fins, and distinctive face. Threatened by pollution, bycatch, and habitat loss, it is classified as endangered.

The Indo-Pacific bottlenose dolphin measures 2–3 m and weighs 150–230 kg, with a light grey streamlined body and a short beak. It forms small coastal groups in shallow tropical and subtropical waters, feeding on fish, cephalopods and crustaceans. Highly social and playful, it often interacts with boats, performing spectacular leaps and bow-riding.

The South Asian river dolphin is a small freshwater cetacean in the family Platanistidae, measuring 2–2.5 m in length, with a pale grey streamlined body and a long narrow beak. It inhabits shallow rivers, oxbow lakes, and canals of the South Asian subcontinent, feeding mainly on freshwater fish and crustaceans. Blind, it uses echolocation to navigate and hunt in turbid waters.

The Irrawaddy dolphin, Orcaella brevirostris, is a freshwater and coastal cetacean known for its rounded forehead and lack of a distinct beak. It typically measures between 2 and 2.7 meters and weighs up to 150 kg. Its skin is light gray with a paler belly. This dolphin is often seen in small groups and is noted for its social and curious behavior. It can swim in both freshwater and saltwater, frequenting estuaries, rivers, and coasts. Unfortunately, it is threatened by habitat degradation, accidental capture in fishing nets, and pollution. Its conservation is crucial to maintaining the balance of the aquatic ecosystems it inhabits.

The Dendrobatidés, belonging to the Dendrobatidae family, is a small frog known for its bright colors and toxic behavior. These frogs typically measure between 2 and 6 centimeters in length and are easily recognizable by their shiny, colorful skin, which can be yellow, blue, red, or green, depending on the species. They are primarily found in the humid tropical forests of Central and South America. Their diet consists of insects, small arthropods, and occasionally small worms. Dendrobatidéss are known for their toxic secretions, which serve as defense against predators. These toxins mainly come from their diet, particularly ants and beetles that contain alkaloids. Dendrobatidéss are also both terrestrial and aquatic creatures, typically laying their eggs in humid places, where their tadpoles develop in small pools of water or decaying leaves. Although fascinating, Dendrobatidéss are vulnerable to habitat loss due to deforestation and pollution.

The Yellow-banded Poison Dart Frog, or Dendrobates leucomelas, is a small, vividly colored frog native to the humid tropical forests of Venezuela, Guyana, and Brazil. It is easily recognizable by its bright yellow bands contrasting with its black body. This coloration serves as a warning to potential predators of its toxicity. Measuring about 3 to 4 cm in length, this species is diurnal and primarily feeds on small insects. It plays a crucial role in the ecosystem by regulating insect populations. Although its skin is toxic, it is prized by terrarium enthusiasts for its striking colors and fascinating behavior.

The Blue Poison Dart Frog, scientifically known as Dendrobates azureus, is a small, brightly colored frog native to the rainforests of Suriname. Its vivid blue skin is dotted with black spots, making it easily recognizable. This bright coloration serves as a warning to potential predators, as it secretes potent toxins through its skin. Measuring about 3 to 4 cm in length, this species is diurnal and spends most of its time hunting small insects. It is often found in humid areas, near streams and ponds. Although its natural habitat is limited, it is popular in the pet trade, leading to conservation efforts to protect its wild populations.

The Golden Poison Dart Frog is a small, vibrant, and colorful frog from the Dendrobatidae family. This species typically measures between 2 and 3 centimeters in length and is easily recognized by its golden skin, often speckled with black. It primarily inhabits the humid tropical forests of Central and South America, particularly in Costa Rica and Panama. The Golden Poison Dart Frog feeds mainly on small insects, ants, and mites. It is known for its toxicity, which comes from its diet, particularly from certain ants and beetles that contain alkaloids. These toxins serve as a defense mechanism against predators. This species is also known for its social behaviors and vocalizations during the breeding season. The eggs of the Golden Poison Dart Frog are laid on the forest floor, and the tadpoles develop in small pools of water or on decaying leaves. While this species is not currently endangered, it is threatened by deforestation and the destruction of its natural habitat.

The Strawberry Poison Dart Frog is a small, vibrant, and colorful frog from the Dendrobatidae family. This species typically measures between 2 and 3 centimeters in length and is easily recognizable by its bright red or orange color, sometimes speckled with blue or black, hence its name "strawberry." It is primarily found in the humid tropical forests of Central America, particularly in Costa Rica and Panama. Its diet mainly consists of ants, spiders, and other small arthropods, which it primarily captures from the forest floor. The bright coloration of its skin is an indicator of its toxicity, which comes from alkaloids found in its diet, particularly ants. These toxins serve as protection against predators. During the breeding season, the Strawberry Poison Dart Frog lays its eggs on the forest floor or in humid areas where the tadpoles develop, often in small pools of water or tiny puddles. While this species is not in immediate danger, it is threatened by deforestation, habitat loss, and pollution.

The Lovely Poison Frog is a small, diurnal terrestrial frog, measuring about 2.5 cm in length. Its body is black with two bright yellow to orange longitudinal stripes on the back, and blue-green marbling on the flanks and limbs. This species inhabits lowland humid forests, often near slow-moving streams, between 10 and 650 m elevation. It primarily feeds on small invertebrates such as ants and spiders. Although its skin contains toxic alkaloids, including batrachotoxins, their concentration is low and sometimes undetectable. The Lovely Poison Frog is listed as Least Concern by the IUCN, but is locally threatened by deforestation and pollution.

The Ranitomeya reticulata, commonly known as the reticulated poison frog, is a small, brightly colored frog native to the humid rainforests of South America, particularly in Peru and Ecuador. It is renowned for its vibrant skin, featuring a complex pattern of black reticulations on a bright yellow or orange background, making it a fascinating specimen for herpetologists and frog enthusiasts. This species is diurnal and primarily feeds on small insects and arthropods. Although its skin is toxic, it poses no threat to humans unless handled improperly. The Ranitomeya reticulata plays a crucial role in its ecosystem by regulating insect populations and serving as prey for certain predators.

The Dendrobates tinctorius, also known as the Blue Poison Dart Frog, is a vibrant species of toxic frog native to the humid tropical forests of South America, primarily in Guyana, Brazil, and Suriname. This frog is easily recognizable by its bright blue color, which serves as a warning to predators of its toxicity. Dendrobates tinctorius are primarily insectivorous and feed on small insects. Their bright color comes from the toxins of the insects they consume in their natural habitat. In captivity, they are not toxic as their diet changes. This frog is also known for its discreet behavior and primarily nocturnal habits.

The Golden poison dart frog, also known as the Terrible Dart Frog, is considered one of the most toxic animals in the world. Native to the tropical forests of Colombia, this small frog is distinguished by its bright yellow color, which serves as a warning to predators of its toxicity. It derives its toxin from its diet, primarily consisting of insects found in its natural habitat. These frogs are not toxic in captivity as their diet changes. Despite its toxicity, it has been used by some cultures to poison the tips of their arrows, earning it the name 'poison dart frog.'

The black-bellied whistling duck is a whistling duck in the family Anatidae, 47–56 cm long, with a long neck, pink bill and grey-brown plumage. It inhabits shallow freshwater ponds, marshes and lakes, feeding on seeds, aquatic plants and small invertebrates. Gregarious and cavity-nesting, it breeds colonially in tree hollows or nest boxes.