@@CHAP@@ RULE 1
@@CHAP@@ STAND UP STRAIGHT WITH YOUR SHOULDERS BACK
@@CHAP@@ LOBSTERS—AND TERRITORY
If you are like most people, you don’t often think about lobsters2—unless you’re eating one. However, these interesting and delicious crustaceans are very much worth considering. Their nervous systems are comparatively simple, with large, easily observable neurons, the magic cells of the brain. Because of this, scientists have been able to map the neural circuitry of lobsters very accurately. This has helped us understand the structure and function of the brain and behaviour of more complex animals, including human beings. Lobsters have more in common with you than you might think (particularly when you are feeling crabby—ha ha).
Lobsters live on the ocean floor. They need a home base down there, a range within which they hunt for prey and scavenge around for stray edible bits and pieces of whatever rains down from the continual chaos of carnage and death far above. They want somewhere secure, where the hunting and the gathering is good. They want a home.
This can present a problem, since there are many lobsters. What if two of them occupy the same territory, at the bottom of the ocean, at the same time, and both want to live there? What if there are hundreds of lobsters, all trying to make a living and raise a family, in the same crowded patch of sand and refuse?
Other creatures have this problem, too. When songbirds come north in the spring, for example, they engage in ferocious territorial disputes. The songs they sing, so peaceful and beautiful to human ears, are siren calls and cries of domination. A brilliantly musical bird is a small warrior proclaiming his sovereignty. Take the wren, for example, a small, feisty, insect-eating songbird common in North America. A newly arrived wren wants a sheltered place to build a nest, away from the wind and rain. He wants it close to food, and attractive to potential mates. He also wants to convince competitors for that space to keep their distance.
@@CHAP@@ Birds—and Territory
My dad and I designed a house for a wren family when I was ten years old. It looked like a Conestoga wagon, and had a front entrance about the size of a quarter. This made it a good house for wrens, who are tiny, and not so good for other, larger birds, who couldn’t get in. My elderly neighbour had a birdhouse, too, which we built for her at the same time, from an old rubber boot. It had an opening large enough for a bird the size of a robin. She was looking forward to the day it was occupied.
A wren soon discovered our birdhouse, and made himself at home there. We could hear his lengthy, trilling song, repeated over and over, during the early spring. Once he’d built his nest in the covered wagon, however, our new avian tenant started carrying small sticks to our neighbour’s nearby boot. He packed it so full that no other bird, large or small, could possibly get in. Our neighbour was not pleased by this pre-emptive strike, but there was nothing to be done about it. “If we take it down,” said my dad, “clean it up, and put it back in the tree, the wren will just pack it full of sticks again.” Wrens are small, and they’re cute, but they’re merciless.
I had broken my leg skiing the previous winter—first time down the hill—and had received some money from a school insurance policy designed to reward unfortunate, clumsy children. I purchased a cassette recorder (a high-tech novelty at the time) with the proceeds. My dad suggested that I sit on the back lawn, record the wren’s song, play it back, and watch what happened. So, I went out into the bright spring sunlight and taped a few minutes of the wren laying furious claim to his territory with song. Then I let him hear his own voice. That little bird, one-third the size of a sparrow, began to dive-bomb me and my cassette recorder, swooping back and forth, inches from the speaker. We saw a lot of that sort of behaviour, even in the absence of the tape recorder. If a larger bird ever dared to sit and rest in any of the trees near our birdhouse there was a good chance he would get knocked off his perch by a kamikaze wren.