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Updated: May 15, 2025
Head flat, belly broad; back of a greenish silver-colour; belly silvery white; length of the body 15-20 inches. It made a singular noise when taken out of the water. We found here Unios of a fine pink and purple colour inside the valves, and a new species of Cyclas with longitudinal ribs.
It kills hares, rabbits, and squirrels when it can catch them, and will rob a bird's nest in the most ruthless manner. It is particularly fond of shell-fish; and the unios, with which many of the fresh-water lakes and rivers of America abound, form part of its food. These it opens as adroitly with its claws as an oyster-man could with his knife.
A comparison of the position of the internal organs of different Species of Unios with the outlines of their shells will leave no doubt that their form is determined by the structure of the animal. A few other and more familiar examples may complete this discussion.
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