About Animals: The Cambrian Period

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Animals Animals Animal Facts Habitat Facts Animal Evolution From Laura Klappenbach, your Guide to Animals 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 blog or browse the growing library of animal profiles. The Cambrian Period The Cambrian Period (543 to 505 million years ago) is the first time period of the Paleozoic Era. It is preceded by the Precambrian. The Cambrian Period opened in the... Read more Search Related Topics:  evolution  cambrian  New Animal Profile - Segmented Worms I just added a new profile to the Animal Encyclopedia. Please extend a warm welcome to the segmented worms. Segmented worms are a group of invertebrates that includes about 12,000 species... Read more Search Related Topics:  invertebrates  worms  Vertebrate Evolution Vertebrates are a well-known group of animals that includes mammals, birds, reptiles, amphibians, and fish. The defining characteristic of vertebrates is their backbone, an anatomical feature that first appeared in... Read more Search Related Topics:  evolution  vertebrates  The Basic Reptile Groups Reptiles are a group of cold-blooded tetrapod vertebrates that diverged from ancestral amphibians about 340 million years ago. There are two characteristics that distinguished early reptiles from amphibians and enabled... Read more Search Related Topics:  reptiles  crocodiles  squamates Related Searches Animals Earth Pictures Dinosaurs Pictures News Letters Nat Geo Animals Featured Articles Mammals Molluscs Reptiles Segmented Worms Sponges More Animal Facts »   More from About.com Run Your First 5K Even couch potatoes can be ready for a 5K with just a couple months of training. Read more...> Help! I'm Too Busy Time and stress management tips to help you feel as though you have more time. Read more...> This newsletter is written by: Laura Klappenbach Animals Guide Email Me | My Blog | My Forum   Sign up for more free newsletters on your favorite topics You are receiving this newsletter because you subscribed to the About.com Animals newsletter. If you wish to change your email address, please click here. If you would like to unsubscribe from all newsletters sent from About.com, please send an email to optout@about.com with "Unsubscribe" as the subject line. About.com respects your privacy: Our Privacy Policy Contact Information: 1500 Broadway, 6th Floor New York, NY, 10036 © 2014 About.com   Must Reads Animals A to Z What is Evolution? Basic Animal Groups Facts About Animals Biomes of the World   Follow me on: Advertisement