Chordates, members of the animal phylum Chordata, which includes all mammals, birds, amphibians, reptiles, and fish. There are about 45,000 species of chordates. They are classified in four subphyla, the largest of which contains the vertebrates. All chordates share three basic characteristics. The first characteristic is a single dorsal nerve cord, which in mammals takes the form of the brain and spinal cord. The second is a flexible rod of cells called a notochord, which in vertebrates takes the form of the backbone. The third is the presence of gill slits at some stage during the development of the animal. All chordates have bilateral symmetry.
Despite the rapid expansion of the pet travel industry, some travel companies still haven't jumped on the bandwagon. You'll need to do a little research before you and your pet leave town to ensure that you are both equally welcome.
Porcupine is a large rodent that has sharp quills covering most of its stocky, short-legged body.