"Hippos spend most of their time in water to keep their skin moist and are the third-largest land mammals."

"Duck feathers are highly waterproof, thanks to oil secreted by a gland near their tail."

"Male lyrebirds have tail feathers shaped like a lyre and are skilled mimics of various sounds, including other bird calls and environmental noises."

"Crabs usually walk sideways; their hard shell is an exoskeleton that must be molted for growth."

"Flatfish are flattened, with both eyes on the same side of the body; juvenile fish have symmetrical eyes, which later migrate."

"Earthworms ingest soil to obtain organic matter; their activity improves soil structure, earning them the name 'ecosystem engineers'."

"Female sea turtles return to the beaches where they were born to lay eggs, with very precise navigation."

"Toad skin is usually rougher and drier than frog skin, and they have poison glands (parotoid glands) behind their eyes for defense."

"Sun bears are the smallest bear species, with very long tongues for lapping up honey and insects, and a U-shaped patch on their chests."

"Oysters can purify water by filtering seawater; some species can produce pearls."

"Elands are among the world's largest antelopes; both males and females have horns (males' are larger), and they have a dewlap on their shoulders."

"Tuataras are ancient reptiles, known as 'living fossils', and have a third eye (parietal eye) on top of their heads."

"Male crickets chirp by rubbing their forewings together to attract females; some species are kept as pets or used for cricket fighting."

"Kestrels are small raptors skilled at hovering in the air to observe prey on the ground, feeding on small mammals and insects."

"Cassowaries are large, flightless birds with a casque on their heads, strong legs, and sharp claws; they can be aggressive."

"Mackerel are schooling pelagic fish, spindle-shaped, fast swimmers, and important commercial fish."

"Goldfish are ornamental varieties developed from crucian carp through long-term artificial selection, with diverse forms and colors."

"Quails are small and good at hiding; they are important economic poultry, providing meat and eggs."

"The black mamba is one of the world's fastest-moving and most aggressive venomous snakes; the inside of its mouth is black."

"Groupers are important food fish, with many species, many of which exhibit sex reversal."