Since I have started this thing, I will start by telling a little story.
Naturally, since my Dad was a lover of all things biological in nature (with the exception of snakes, although he did a good job of hiding it from his students), I too spent much of my time in Peru chasing down all sorts of fascinating bugs, plants and animals. One particular treat was digging up iguana eggs so that we could hatch them and raise the little critters, although in reality, they typically had very short lives in our care. Steven and I did a lot of digging for iguana eggs until about the sixth grade when we got smart and decided to save ourselves some work. We found a fresh nest behind my house, but instead of going to the trouble of digging it up, we put a cage over the hole that had no bottom in it, so that when the iguanas hatched they would dig themselves out of the hole and end up in our cage. It was a good plan, and for weeks we diligently checked that cage every day in hopes that it would be teeming with little green lizards. Eventually we stopped checking every day, and by the time our trap had done its job, we had nearly forgotten about it entirely. One of the iguanas we pulled out of the cage when we finally got around to it was so skinny and sickly that we thought it would never survive, but having seen so many iguanas die in my care over the years, I was determined to do all I could to nurse it back to health. I spent hours each day with my new pet and fed it everything I could get it to swallow. Then one day I went out for a walk around the track with my little friend who was finally starting to look healthy, and as iguanas often do, it climbed up onto my head and sat there basking in the jungle sun as I went walking. Then out of the blue, something hit me on the top of my head so hard it knocked me to my knees. I looked around me, ready to pummel whoever had hit me, but no one was there. For a moment I was dazed and confused, wondering what strange phenomenon had sent me to my knees. That is when I looked up and saw, to my dismay, a large hawk flying away with a small lizard dangling from it's talons. I was crushed and ran home to tell my parents what had happened, hoping for some sympathy, but instead... they laughed.
