Chordates

Animal with a spinal cord protected by a backbone

Amphibians

• Examples: frog, toad, salamander, newt

Amphibian

• Cold blooded (same temp as outside)

• Young breathe with gills/skin• Adult breathes with lungs/skin• Skin is thin, moist• Circulatory system: closed (has

veins and arteries)

Amphibian

• Lay eggs in the water• Eggs are jelly mass of• 100-1000’s of eggs• Body development:

metamorphosis from egg to tadpole to adult

Giant Cane Toad• Has poison glands so

other organisms cannot eat them

• Introduced to Australia in 1935 to eat Cane beetles (pest)

• Population exploded, because they kill all predators with poison.

• Can’t get rid of them now.

Reptiles

• Examples: snake, turtle, alligator, crocs, lizards

Reptiles

• Temp: cold blooded• Young breathe with lungs• Adult breathes with lungs• Skin: dry, scaly

Reticulated python at American history museum

(nyc)

Reptiles

• Closed circulatory system• Lay eggs in mud, sand, nest• Eggs: leathery, • 30-50• Body development: no

metamorphosis

Watching reptiles eat

http://webh01.ua.ac.be/funmorph/movies.html

Fish• Cold blooded• Young breathe with gills• Adults breathe with gills• Skin: slimy, scaly (usually)

hagfish

•

Fish

• Closed circulatory system• Lay (jelly) mass of eggs in water• 100’s-1000’s• Body development: no

metamorphosis

Video clips

• http://www.arkive.org/species/GES/reptiles/Chelonia_mydas/Chelonia_mydas_09c.html?movietype=wmMed green sea turtle laying eggs

• http://www.expertvillage.com/interviews/poison-frogs.htm feeding poisonous dart frogs

• http://www.vivanatura.tv/Htorquata1.html snake eating a frog

http://www.nationalgeographic.com/kids/creature_feature/0203/frogs.html

tree frog, not so great