Introduction to Vertebrates

The video discusses the phylum Chordata, focusing on vertebrates, which include fish, amphibians, reptiles, birds, and mammals. Vertebrates are characterized by a backbone and a spinal cord. The video explains the differences between cold-blooded and warm-blooded animals and reviews the major classes of vertebrates, highlighting their unique features. Fish are aquatic with gills, amphibians transition from gills to lungs, reptiles have scaly skin, birds have feathers and can fly, and mammals have hair and produce milk for their young.

Describe the reproductive habits of amphibians as mentioned in the text.

What unique features do mammals have compared to birds?