In 1994 Canada
issued its fourth and final set in the Prehistoric Life in Canada series postage stamps. The stamps featured Woolly
Mammoth, the Short-faced Bear, the rhino-like Megacerops, and the tapir like Coryphodon.
All these creatures are considered mammals. Mammals appeared about 190 million years ago,
and became dominant after extinction of dinosaurs some 65 million years ago. They are
warm-blooded, hairy animals with backbones, possessing four-chambered hearts and
diaphragms to help breathing. Most of them give birth rather than laying eggs, and all
feed their young from milk-producing mammary glands unique to the class Mammalia. The four
depicted here are long since extinct.
Prehistoric Life in Canada series postage stamps. The stamps featured Woolly
Mammoth, the Short-faced Bear, the rhino-like Megacerops, and the tapir like Coryphodon.
All these creatures are considered mammals. Mammals appeared about 190 million years ago,
and became dominant after extinction of dinosaurs some 65 million years ago. They are
warm-blooded, hairy animals with backbones, possessing four-chambered hearts and
diaphragms to help breathing. Most of them give birth rather than laying eggs, and all
feed their young from milk-producing mammary glands unique to the class Mammalia. The four
depicted here are long since extinct.