Animals are divided into two main groups: Animals with a backbone are called vertebrates. Animals without a backbone are called invertebrates ... Keep an eye out for these amphibians near rivers ...

Vertebrates are animals that have a backbone inside their body. The major groups include fish, amphibians, reptiles, birds and mammals. Invertebrates don't have a backbone. They either have a soft ...

Discover the watery world of jellyfish, seahorses, sharks and other ocean creatures. Learn about the characteristics of marine vertebrates and invertebrates by observing museum specimens. Science ...

Mike Anglin | Dallas, Texas Human-caused factors have led to anatomical changes in both vertebrates and invertebrates ... They can move air in and out of that sac to help them with buoyancy.