"Orangutans are arboreal, spending most of their time in trees, and their arms are much longer than their legs."

"Ptarmigan plumage changes with the seasons, turning pure white in winter to adapt to snowy environments; they are important tundra birds."

"Hagfish are primitive jawless fish that can produce copious amounts of slime for defense and feed on carrion or invertebrates."

"Male markhors have unique, spirally twisted horns; they are the national animal of Pakistan."

"Red-eyed tree frogs have large, bright red eyes and colorful bodies, are nocturnal, and skilled climbers."

"Wildebeest are famous for their large-scale seasonal migrations, where millions cross plains in search of water and grass."

"Sea urchins are covered in spines for defense and movement and feed on algae or organic debris."

"Paddlefish have a very long, paddle-shaped snout (rostrum) covered in sensory receptors for detecting plankton; they are filter feeders."

"Ospreys are specialized fish-eating raptors, with special adaptations on their feet for gripping fish, and can dive into water from the air to hunt."

"Aye-ayes are nocturnal primates with a very long middle finger used for tapping on trees to find and extract insect larvae; they have a peculiar appearance."

"Male grasshoppers produce sound by rubbing their hind legs against their wings to attract females or declare territory."

"Badgers are burrowing animals and dig complex underground tunnel systems called 'setts'."

"Chamois are light-bodied and agile, skilled at leaping in rugged mountain terrain, with short, backward-curving horns."

"Capuchin monkeys are intelligent, with prehensile tails, and are often considered among the most intelligent New World monkeys."

"The Atlas moth is one of the largest moths by wingspan; the leading edges of its wings resemble snake heads, used to intimidate predators."

"Polar bears are the largest land carnivores, primarily feeding on seals, and are adapted to extremely cold environments."

"Humpback whales are known for their spectacular breaching behavior and complex courtship songs; their pectoral fins are exceptionally long."

"When threatened, some sea cucumber species expel their internal organs to confuse predators and can later regenerate them."

"Pangolins are covered in keratinous scales, the only mammals with scales, and curl into a ball when threatened."

"Tortoises are terrestrial herbivorous turtles, very long-lived, and some species can weigh hundreds of kilograms."