1. Endotherms Carnivores = Eat only meat. Herbivores = Eat only plants.
Omnivores = Eat both plants and meat.

2. Endotherms part II
Umbilical cord – attaches the embryo to the placenta.
Gestation – Time during which and embryo develops in the uterus.
Incubating – Keeping eggs warm until they hatch.
Mammals and birds fertilize internally.
In a bird the embryo develops in the egg.

3. Mammals Covered with hair or fur.
Well-developed lungs, four-chambered heart.
A nervous system.
Specialized Teeth
Incisors (biting and cutting)
Canines (grip and tear)
Pre-Molars (flat for grinding plants)
Molars (flat for grinding plants)

4. Mammals Care for their young.
Give birth to live young, and feed them milk from mammary glands.
Placentals have well developed young before they are born. Develop in the uterus. Humans, cows, mice, whales
Marsupial young are born very immature and move to a pouch (usually). Kangaroos, Opossums.
Monotremes are born in an egg! Platypus

5. Birds Covered in feathers. Most can fly.
Lay a hard-shelled egg. Amniotic egg Shell is made of calcium carbonate. (like seashells)
Hollow bones.
Beaks
Endothermic with rapid heartbeats.

6. Flight Hollow bones make the bird lighter.
Air sacs help it get more oxygen which is fuel for the muscles. Gets oxygen while exhaling and inhaling.
Feathers help a bird steer up, down, right and left.
Wings.
Strong chest muscles.

7. Wings
Used for flying.
Used for swimming.
Used for running.

8. Feathers Contour Feathers – Strong, help birds fly.
Down Feathers – Soft and fluffy insulation.
Preening – Rubbing oil over the feathers.

9. Mammal Orders Carnivora: cats, dogs, foxes
Primate: apes, monkeys, humans
Cetacea: whales, dolphins, porpoises
Perissodactyla: horses, zebras
Rodentia: mice, rats, squirrels
Chiroptera: bats