Monotremes are among the most enigmatic – and weird – creatures in the animal kingdom, bridging the gap between\u00a0mammals,\u00a0birds\u00a0and\u00a0reptiles.<\/p>\n
Join us as we explore the remarkable world of egg-laying mammals, where ancient lineage meets extraordinary adaptation.<\/p>\n
Monotremes are egg-laying mammals. Monotremes aren\u2019t viviparous (live-bearing) but oviparous, so young are sustained by yolk until they hatch. Hatchlings (nicknamed puggles) must lick the milk secreted from a mother\u2019s skin, as females don\u2019t have nipples. There are only five living species: four kinds of echidna plus the platypus \u2013 a semi-aquatic creature that looks like a\u00a0beaver and a duck\u2019s love-child.<\/p>\n
Monotremes have just one orifice or \u2018cloaca\u2019 for urination, intercourse and defaecation, hence the name \u2013 monotreme comes from the Greek for \u2018single opening\u2019. It\u2019s one of several reptilian or bird-like traits that were probably present in the common ancestor of all living mammals.<\/p>\n
But while monotremes are considered primitive, they have some sophisticated features too. Their snout (or beak\/bill) can sense electricity to detect prey, for example, and platypus males have venomous leg spurs.<\/p>\n