Julia Solis I-v)Mammals

Mammalia Mamma: Latin Current # of living mammals: around 5,490 1st mammal: Megazostrodon 3 types:

Monotremes: egg-laying mammals (short beaked echidna) Marsupials: born in immature state; most have pouches

(Koala) Placental: born in advanced stage; nourished through a

placenta (Fox)

Life Cycle & Span Birth, young mammal, adult Born with different maturity level Adult females reach fertility at different ages Mothers produce milk to feed the baby Average human life span in 1st world: 75 years

Characteristics Sweat glands and are able to produce milk 3 middle ear bones (hammer, anvil, stirrup) Warm-blooded (endothermic) Have hair Eukaryotes Diphiodonty

Characteristics Larger and more developed brain Vertebrates Limbs (flippers, wings, legs and arms) Four chambered heart Amniotes Single-bone jaw Heterotrophic

Diet & Digestive System Herbivores: plants (cows, sloths…) Carnivores: meat (lions, wolves) Omnivores: plants & meat (people, some

bears…) Insectivores: Insects (anteaters) Don’t all have the exact same digestive system

Basics: mouth, esophagus, stomach, intestines

Nervous System All brains have a Neocortex Placental mammals: corpus callosum Based on the brain and spinal cord Divided in four parts (central, autonomic,

peripheral, and somatic)

Circulatory System 4 chambered heart Pulmonary and body circulations are independent Oxygenated blood goes to left atrium (entrance) Deoxygenated blood from tissues go to right

Respiratory System Ventilatory (breathing) tool (lung) Mammals’ lungs are less efficient than birds Ventilation causes negative pressure pump

developed in diaphragm through evolution

Bibliography http://www.kidzone.ws/animals/mammals.htm http://www.enchantedlearning.com/subjects/mammals/ http://www.currentresults.com/Environment-Facts/Plants-

Animals/number-species.php

http://www.factmonster.com/ipka/A0934288.html http://www.bbc.co.uk/nature/life/Mammal http://www.newton.dep.anl.gov/natbltn/400-499/nb486.

htm http://www.merriam-webster.com/dictionary/mammal