Our planet is populated with both odd and amusing plants and animals. Some of them have been surrounded by myth and misunderstanding, and some we still know little about. David Attenborough’s series “Natural Curiosities” has revealed the remarkable evolutionary traits behind some of the most mystical wonders of the natural world.

Some of the quirky animals include flamingos, who survive in hot volcanic lakes by filtering out microscopic algae; salamanders that can regrow entire limbs; problem-solving crows that design intricate tools; and hippos, who secrete a vivid red mucus that acts as sunscreen.

In an interview with Radio Times, David Attenborough recounted the particularly peculiar case of a greenfly that’s nearly all female. “Inside they are already pregnant. And inside the baby that’s inside the mother there’s another one. So you’ve got three generations all in one animal.” As bizarre as it sounds, that’s a very common insect we don’t really think of much.