Amphibians in General
Like birds, reptiles, mammals, and fishes, amphibians are vertebrates –- that is, creatures with a backbone and an internal skeleton. Amphibians live part of their life in water and part on land. Even those species that lay eggs on land start life in a fluid-filled egg, breathing through gills.
All adult amphibians are meat eaters, or carnivores. They actively search for other animals—usually insects—to eat. Larval salamanders are also meat eaters. Most larval frogs are plant eaters, or vegetarians, although a few eat both plants and small animals
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Basic Facts/summary about Chapter 42
- Amphibians evolved from lobe-finned fishes about 370 million years ago
- Ichthyostega and the other early amphibians had lungs and four legs. They were predominantly aquatic, they had a lateral line and a fishlike tail fin, they had some gills.
- Modern Amphibians are divided into three orders: Anura (Frogs and Toads), Urodela (Salamanders), and Apoda (caeciallians)
- Anurans are found on all continents except Antartica, they have karge hind legs for jumping and a strong skeleton.
- Salamanders have four legs and a tail. They are mostly found in North and Central America.
- Caecilians are legless tropical amphibians that resemble Earth Worms.