I've enjoyed reading an article in the Daily Mail giving a bunch of facts and figures about nature and animals that beggar the imagination. Here are a few examples.
Fish: Did you know that many species of polar fish produce their own antifreeze, in the form of large protein molecules in the blood?
Speed of flight: If you use body lengths per second (bl/sec) as a measure of speed, a supersonic fighter jet can cover up to 150 bl/sec; the Space Shuttle at its fastest can cover 207 bl/sec; but the tiny Anna's Hummingbird eclipses them all, at 383 bl/sec!
Migration: According to the article;
... every autumn, about five billion birds take off from Northern Europe and Asia and head for the south, and about the same number take off from North America and head for Tropical America and beyond.
About 5,500 species — about half of all bird species — undertake some form of migration. On their first trip, some young birds simply follow their parents, but many, like young swallows, set out unchaperoned.
Yet how do they know where to go?
Again, no one really knows.
There's much more at the link. It's a fascinating read.