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If an island is large enough and isolated from land-based predators for enough time, one thing invariably happens: giant birds evolve.

There were once hoofed animals that did not just graze and run in herds. Among their ranks were gigantic beasts with bone-crushing jaws that were the most powerful predators of their time. They ruled the earliest grasslands, taking prey up to the size of rhinos while contending with other deadly hunters. They are the entelodonts, the aptly named ‘terminator pigs’.

A study done in January 2017 involving 30 fish fossils from Middle Triassic China revealed anatomical differences that helped scientists set apart male from female fish.