1. A group of fish is called a school. What name is applied to a group of dolphins, porpoises or whales?

2. One of the most destructive mollusks for humans is the shipworm. Why is this creature dangerous?

3. How do the claws of the male and female fiddler crabs differ?

4. What is unique about the shells of hermit crabs?

5. The skeletons of sea otters are often purple in color. What causes this coloration?

Answers

1. A group of dolphins, porpoises or whales is called a "pod" or sometimes a "herd."

2. The shipworm causes damage by boring into wooden ship hulls and dock pilings.

3. Male fiddler crabs have one very large and one small claw. The female has two small claws.

4. Since they are not true crabs, hermit crabs have no shell of their own. They change shells as they grow.

5. The coloration of the sea otter's skeleton is most likely a result of its diet of sea urchins, which have a purple hue to their shells.

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