| | Welcome to the Animals / Wildlife Newsletter, a weekly newsletter published by About.com's Animals / Wildlife website. For more about animals and wildlife, be sure to stop by the growing library of animal profiles. | | Velvet Worms: The Magnificent Walking Worms Velvet worms are a group of invertebrates that includes about 110 living species. Although modern velvet worm species are all terrestrial, their ancestors were marine animals.
| Flatworms: Meet the Planarians, Flukes, and Tapeworms Profile of flatworms, a group of invertebrate animals that includes planarians, tapeworms, and flukes.
| Amniotes: The Innovators of the Four-Membraned Egg Amniotes (Amniota) are a group of tetrapods that includes birds, reptiles, and mammals. There are about 25,000 species of amniotes alive today.
| Tetrapods: The Four-By-Fours of the Vertebrate World Profile of tetrapods, a group of vertebrates that includes amphibians, reptiles, birds, and mammals.
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