Animals

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

More Questions from Animals
Which other big cat is bred with a tiger to make the tigon?
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Which animal roars?
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Which is the largest kangaroo?
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Which insect has a hearing organ in one of it's wing veins which enables it to hear the shriek of bats?
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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 of the following has naturally pricked ears?
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Which kind of tree Is usually used by the Secretary Bird to make its nests?
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What is a nocturnal, giraffe-like animal from the African rainforests called?
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