Notochord, a flexible supporting rod along the back of an animal. It is present in all chordate animals at some stage in their development. A primitive chordate retains it throughout life. In higher vertebrate animals, the notochord is replaced before birth by a backbone.
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Imagine your pet on the open road -- motoring down the freeway with the wind in its fur. Doesn't it make you want to strap Fido or Fluffy to the back of your Harley-Davidson?