Penguins underwater look somewhat like dolphins, and indeed the two families have similar evolutionary histories. Dolphins are descended from air-bre… - David Attenborough

No sooner has one been pushed out of the nest then a second will follow, until there is only one left. And that's what happens nearly always in a pelican's nest. That being the case, it seems rather inefficient, not to say heartless, that the pelican should always lay three eggs. But the reason is that it's partly an insurance policy, in case something terrible happens to one or two of the chicks, there's always a third left to carry on. And partly because, very rarely, when the fishing is very good, it is possible to raise more than one chick.

Ever since we arrived on this planet as a species, we've cut them down, dug them up, burnt them and poisoned them. Today we're doing so on a greater scale than ever […] We destroy plants at our peril. Neither we nor any other animal can survive without them. The time has now come for us to cherish our green inheritance, not to pillage it – for without it, we will surely perish.

Um, so, the world is not as wild as it was. Well, we've destroyed it. Not just ruined it. I mean, we have completely... well, destroyed that world. That non-human world is gone. Uh.... The... Human beings have overrun the world.