Echidna — the spiny anteater of Australia and New Guinea

Physical characteristics

Echidnas have a compact, rounded body covered with coarse hair and many sharp spines that provide protection. Their snout is elongated and tube-like, functioning both as a mouth and a nose; this form is often described as a long, tubular mouth. They feed by flicking a sticky tongue to capture ants, termites and other invertebrates. Unlike most mammals, echidnas do not have teeth; food is ground between the tongue and a bony palate.

Behavior and diet

Echidnas are primarily solitary, terrestrial foragers that use powerful limbs and curved claws to dig for prey and create burrows. When threatened they may curl into a spiny ball or rapidly dig into soft ground so only the spines are exposed — a defense aided by their long, sharp claws. Echidnas also have electroreceptors in the snout that help detect prey buried in soil.

Reproduction and development

As monotremes, echidnas lay a small, leathery egg which is incubated in a temporary pouch on the female. The infant, called a puggle, hatches and nurses on milk from the mother’s mammary glands; monotreme milk is often expressed onto skin or into grooves rather than via nipples. Males possess a spur on the hind leg similar to the platypus, but in echidnas this spur is not known to deliver venom.

Distribution, roles and conservation

The short-beaked echidna occupies a wide range of habitats across Australia, while the long-beaked species in the genus Zaglossus are found in parts of New Guinea. Echidnas contribute to ecosystem health by controlling insect populations and aerating soil through digging. Some species face threats from habitat loss and predation, and conservation status varies among populations.

Notable facts and distinctions

Echidnas share the monotreme group with the platypus and illustrate an early branch of mammalian evolution. They combine unique features — egg laying, lactation without nipples, sensory electroreception, and a spiny coat — that set them apart from placental and marsupial mammals. For cultural and scientific information, see general references on monotremes and regional natural histories (monotreme overview, reproductive notes). For more natural history and field resources consult region-specific guides and databases (anatomy, feeding, family Tachyglossidae).