Sensitive, intelligent elephants are the world’s largest land mammal (by weight) and a living link to long-extinct species like the woolly mammoth.
From butterflies to beetles, moths to mosquitoes, insects are a diverse bunch—and they’re crucial to keeping ecosystems healthy.
They look like a deer crossed with a giant jack rabbit; with long, muscular tails and belly pouches, kangaroos are the world’s largest marsupial.