monotremes

Researchers tagging marine animals off Australia’s Orpheus Island were shocked when a tiger shark they caught spat up an echidna, a grub-eating monotreme recognizable for its spine-covered body. Known for eating just about anything, it seems this tiger shark met its match.

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Billions of years of evolution has given rise to us, the millions of species that persist on planet Earth today. Some of us are small, some of us are big, and some of us have huge ears, flat tails, compound eyes, or infrared vision.