Those are awfully complex structures, I couldn’t make one!
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The part about beavers fascinates me. First, they select a site where blocking a portion of the stream will result in a pond. They get it right the first time, they don’t have to try twenty times until they accidentally get it right.
They start building the dam and the beaver nest at the same time. As they slowly raise the dam, the water backs up and forms a small pond, which grows as the dam rises. The beaver drags branches and small logs into position as the water level rises because the logs float.
The beaver nest is in the middle of where the pond will be, but he starts building the nest before there is a pond. Before the pond reaches its future height (how would he calculate that?) he builds an entrance that will be below water when the pond is complete.
Then, he continues building the dome that will be the nest. A coyote might have to swim to get to the nest in the center of the pond, but…it would have to swim underwater to get to the entrance.
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