Animals

Which small sea animal is considered to be a link between vertebrates and invertebrates?

More Questions from Animals
In what country did the bloodhound originate?
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What animal is figuratively "in the room" when avoiding an obvious topic?
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Which bird is also known as the South American ostrich?
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Which of these is a huge animal from Africa or Asia that has one or two horn-like spikes?
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Which other big cat is bred with a tiger to make the tigon?
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What is a mammal that has wings and is capable of sustained flight?
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Which ocean creature is prickly like a porcupine?
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What is a baby sea lion called?
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