why DID we evolve into humans?

For a good explaination of how eyes might have evolved, including references to examples in nature of each step, Look here

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Aslan is not a Tame Lion

I belive that the mistake you are making is assuming direction and purpose.What seems to be happening is something subtly different. Our hands did not evolve because we used them more. Rather, by chance, some humans were born with a slightly different hand that allowed them to do things that others could not. Them that could had an advantage over them that could not and so had a greater chance of living to reproduce.In the case of the giraffe, one was born that could reach a food source that others could not reach. Again, just random chance. Having a food supply that the others could not reach was an advantage, so the longer necked critters had a better chance to live long enough to reproduce.JMHO & YMMV.

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Aslan is not a Tame Lion

We certainly know that for grass. You would think after getting cut weekly for several decades it would learn to keep its head down.

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Aslan is not a Tame Lion

Ned and Crash did a great job of answering your questions but I'd like to add to what they've said. Surprisingly, woodpeckers do not live solely on insects from hard trees. They also eat fruit and seeds.Here is a link to which fruits will atttract which birds and surprisingly, you'll find that many of the fruits will attract woodpeckers. What Birds eat what fruitAnd from the Florida birders guide is an article that expands from fruit to include information on other feeding habits and also nesting. Again, it's observed that woodpeckers will use man made nests instead of building.Having lived for many years in the habitat of the Pileaated Woodpecker, the classic example of the real strongly built, chip the wood away species, I can tell you that they favor softer woods like pine over oak, and a dead tree over a live one. I have spent many a year watching and studying woodpeckers and they are remarkable critters, but no real mystery.Notice in this picture from the Wake Audubon site, that the Pileated Woodpecker nest is built in a pine tree. Wake Audubon siteThe picture is in the left colum about halfway down.I have never observed a Pileated Woodpecker nest in anything except a pine tree or dead tree.By the way, the Pileated Woodpecker is BIG and most impressive. Awesome even.

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Aslan is not a Tame Lion