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.
Seal is a meat-eating mammal found in all oceans of the world, but most abundant in Arctic and Antarctic waters.
For some people, traveling without their pets simply isn't an option. Airlines will happily accommodate these four-legged friends, but you must plan carefully to avoid headaches at the airport.