Why do some mammals lay eggs?
The reason that odd, egg-laying mammals still exist today may be because their ancestors took to the water, scientists now suggest. The egg-laying mammals — the monotremes, including the platypus and spiny anteaters — are eccentric relatives to the rest of mammals, which bear live young.
What are the only mammals that lay eggs?
Egg-laying Mammals There are only five living monotreme species: the duck-billed platypus and four species of echidna (also known as spiny anteaters). All of them are found only in Australia and New Guinea.
How do echidnas defend themselves?
Believe it or not, the spines you see on an echidna are actually long, tough, hollow hair follicles. These spines are an echidna’s main line of defence when predators strike. When under threat, they will roll up into a ball of radiating spines to protect themselves or dig themselves to safety.
What does Tachyglossus aculeatus stand for?
Foraging pits of the short-beaked echidna ( Tachyglossus aculeatus) as small-scale patches in a semi-arid Australian woodland. Soil Biology & Biochemistry, 39: 1055-1065.
What does aculeatus mean in Echidna?
The name Tachyglossus means “quick tongue”, in reference to the speed with which the echidna uses its tongue to catch ants and termites, and aculeatus means “spiny” or “equipped with spines”.
What makes the echidna (Tachyglossus aculeatus) live so long?
Hulbert, A., L. Beard, G. Grigg. 2008. The exceptional longevity of an egg-laying mammal, the short-beaked echidna ( Tachyglossus aculeatus) is associated with peroxidation-resistant membrane composition. Experimental Gerontology, 43: 729-733.
What are the adaptations of Tachyglossus?
Tachyglossus aculeatus lacks external pinnae and teeth but does have hard pads in the back of the mouth. Short-beaked echidnas possess several adaptations to their foraging habits including tubular snouts, long sticky tongues, and front paws for digging.
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