Chapter 30 Mammals Section 1 Mammalian Characteristics Section

Chapter 30 Mammals Section 1: Mammalian Characteristics Section 2: Diversity of Mammals Click on a lesson name to select.

Chapter 30 Mammals 30. 1 Mammalian Characteristics Hair and Mammary Glands § Two characteristics that distinguish members of class Mammalia from other vertebrate animals are hair and mammary glands.

Chapter 30 Mammals 30. 1 Mammalian Characteristics Functions of Hair 1. Insulation 2. Camouflage 3. Sensory devices 4. Waterproofing 5. Signaling 6. Defense

Chapter 30 Mammals 30. 1 Mammalian Characteristics Other Characteristics § Endothermy § Source of body heat is internal. § Heat is produced by a high metabolic rate. § Body temperature is regulated by internal feedback mechanisms.

Chapter 30 Mammals 30. 1 Mammalian Characteristics Feeding and Digestion § Daily intake of food is used to generate heat to maintain a constant body temperature.

Chapter 30 Mammals 30. 1 Mammalian Characteristics

Chapter 30 Mammals 30. 1 Mammalian Characteristics Trophic Categories 1. Insectivores 2. Herbivores 3. Carnivores 4. Omnivores

Chapter 30 Mammals 30. 1 Mammalian Characteristics Teeth § Reveal the life habits of a mammal § Carnivores use canines to stab and premolars to slice and shear meat. § Incisors of insectivores are long and curved, functioning as pincers in seizing insect prey.

Chapter 30 Mammals 30. 1 Mammalian Characteristics Excretion § Kidneys excrete or retain the proper amount of water in body fluids. § Enables mammals to live in extreme environments Mammals

Chapter 30 Mammals 30. 1 Mammalian Characteristics Respiration § High levels of oxygen are required to maintain a high level of metabolism. § Mammals are the only animals that have a diaphragm.

Chapter 30 Mammals 30. 1 Mammalian Characteristics Circulation § Mammals require a consistent supply of nutrients and oxygen to maintain homeostasis. § Keeping oxygenated and deoxygenated blood separate makes the delivery of nutrients and oxygen more efficient.

Chapter 30 Mammals 30. 1 Mammalian Characteristics The Brain and Senses § Mammals have highly developed brains. § Cerebral cortex is responsible for coordinating conscious activities, memory, and the ability to learn. § Cerebellum is responsible for balance and coordinating movement.

Chapter 30 Mammals 30. 1 Mammalian Characteristics Complex Behavior Senses § The importance of the senses varies from one group of mammals to the next. Glands § A system of glands secretes a variety of fluids that helps to regulate a mammal’s internal environment.

Chapter 30 Mammals 30. 1 Mammalian Characteristics Reproduction § In mammals, the egg is fertilized internally. § Development of the embryo takes place in the female uterus. Movement § Mammals must find food, shelter, and escape from predators.

Chapter 30 Mammals 30. 2 Diversity of Mammals Mammal Classification § Monotremes § Marsupials § Placental mammals

Chapter 30 Mammals 30. 2 Diversity of Mammals Monotremes § Reproduce by laying eggs § Duck-billed platypus

Echidna

Chapter 30 Mammals 30. 2 Diversity of Mammals Marsupials § Very short period of development in the uterus § Crawl into a pouch made of skin and hair and continue development while being nourished by milk from the mother’s mammary glands § Marsupials Kangaroo

Chapter 30 Mammals 30. 2 Diversity of Mammals Placental Mammals § Give birth to young that do not need further development within a pouch Humpback whale

Oh My!!

Chapter 30 Mammals 30. 2 Diversity of Mammals