BIRDS, MAMMALS and OTHER ANIMALS

Exciting pictures & detailed, specialized in-
formation on a wide variety of species and
their adaptations. Coverage includes birds,
primates,endangered, exotics,scavengers,
marine, nocturnal,aggression, learning,etc.

INTRODUCTION TO MAMMALS
Detailed artwork introduces the class Mammalia. Many multi-image comparisons. 20 frames and extensive text.
#SS-0680S SLIDES
$42.50

INTRODUCTION TO MAMMALS Order #SS-0680S........$42.50

A graphical tour of the mammalian orders, illustrating specific representatives.
Numerous aspects of biology and physiology are treated. 2O slides and extensive guide.
(Filmstrip order SS-0680F.....$15.00.)

CONTENT SAMPLE: 5. Mammals are second only to birds as the most active
animals. This considerable activity and a high rate of metabolism in the face of changing
environmental conditions, make the mammals a very successful group.

Mammals as a group are warm-blooded. They are homoiothermic and keep body
temperature within a narrow range, regardless of ambient temperature. The source of body heat
is metabolic, powered by their high intake of food. The temperature regulating mechanism is the
hypothalamus of the brain. It reacts to small differences in body temperature and coordinates
nerve impulses from temperature receptors in the skin. The skin is of great importance in
conserving or disposing of excess heat from the body. Insulating layers of hair and/or fat prevent
heat loss in cold weather. The sweat glands, when present, dissipate heat by evaporative
cooling. Dogs and other canines, for example, have few if any sweat glands and sweat through
their tongues and respiratory surfaces to throw off excess heat, as shown in the upper left.
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0680t15d Newborn kangaroo. graphic by Educational Images Ltd.

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