1. 4 groups
1.1. Birds
1.1.1. classified as two types
1.1.1.1. flying birds
1.1.1.1.1. examples
1.1.1.2. flightless birds
1.1.1.2.1. examples
1.1.2. Characteristics of Birds
1.1.2.1. feathers
1.1.2.2. a beak
1.1.2.3. two wings
1.1.2.4. two legs
1.1.2.5. lays eggs
1.1.2.5.1. Eggs protected
1.2. Fish
1.2.1. Characteristics of Fish
1.2.1.1. Live in water
1.2.1.1.1. sea water
1.2.1.1.2. fresh water
1.2.1.2. scales on body
1.2.1.3. gills
1.2.1.3.1. for breathing in water
1.2.1.4. fins
1.2.1.4.1. for swimming
1.2.1.5. lays eggs
1.2.2. examples
1.2.2.1. goldfish
1.2.3. special body shapes
1.2.3.1. sea horses
1.2.3.2. snake-eel
1.2.4. give birth to its young
1.2.4.1. guppies
1.2.4.2. Molly
1.2.4.3. Swordtail
1.2.5. tough, leathery skin
1.2.5.1. mudfish
1.2.5.2. catfish
1.3. Insects
1.3.1. Characteristics of Insects
1.3.1.1. six legs
1.3.1.2. body parts are divided into 3
1.3.1.2.1. head
1.3.1.2.2. thorax
1.3.1.2.3. abdomen
1.3.1.3. anntenae
1.3.2. Wings
1.3.2.1. 2 pairs of wings
1.3.2.1.1. butterflies
1.3.2.2. 1 pair of wings
1.3.2.2.1. fly
1.3.2.2.2. mosquitoes
1.3.2.3. no wings at all
1.3.2.3.1. ants
1.4. Mammals
1.4.1. Characteristics of Mammals
1.4.1.1. hairs
1.4.1.2. Give birth to young alive
1.4.1.3. feed their babies with mother's milk
1.4.2. examples
1.4.2.1. cats
1.4.2.2. tigers
1.4.2.3. elephants
1.4.2.4. whales
1.4.2.4.1. marine mammals
1.4.2.5. dolphins
1.4.3. lay eggs
1.4.3.1. platypus
1.4.3.2. Spiny anteater
1.4.4. vertebrate animals
1.4.4.1. backboned animals
1.4.5. warm blooded
1.4.5.1. temperature of body does not change with the temperature of surroundings