1. Amphibians

2. Amphibian means double life
5,400 species
Animals that spend the first part of their life in water and spend their adult life on land
Examples of modern amphibians are frogs and salamanders

4. Specialized Body Parts
Eggs do not have shells so they must be hatched in water.
Young amphibians will live in the water until they develop into adults that can live on land
They are ectothermic
As developing young they have gills to breathe
During development they often grow legs

5. Thin Skin – Smooth and moist, so thin water can be absorbed through it, no need to drink
Lungs to breathe as adults
Bright colors to warn predators that they have poison

6. Metamorphosis Most amphibians will change as they grow
Salamanders begin as larvae with gills

7. Kinds of Amphibians
Caeclians – From areas in Asia, Africa, and South America
Over 160 species
Look like snakes or earthworms
Do not have legs
Some have bony scales

8. Salamanders, 500 known species, most like prehistoric amphibians
Live in moist environments as adults
Most start with gills that develop into lungs

9. Frogs and Toads – make up 90% of Amphibians
Found all over the world except in cold places
Have strong legs, well developed ears and vocal chords
Long sticky tongue
Well known for nighttime singing using vocal sacs

10. Ecological Indicators
Very sensitive to changes in their environment
Thin skin absorbs any harmful chemicals
As ectotherms any climate change impacts them