Most mammals give birth to live young, but monotremes—like the platypus and echidna—lay eggs instead. These rare creatures, found in Australia and New Guinea, combine mammalian traits with reptilian reproduction, making them truly unique in the animal kingdom.
Platypuses have electroreception, allowing them to detect prey underwater, while echidnas use long tongues to eat ants and termites. Their unusual reproduction and adaptations make them some of nature’s most fascinating mammals.