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" ... Ecologists call this “the costs of carnivory,” and those costs kick in once an animal weighs more than about 21 kg. If they really weighed 29.5 kg, then thylacines should have been ambitious big-game hunters, too. But they just weren’t built for it. The skulls, jaws, and teeth of thylacines weren’t built for the kinds of forces and structural stresses involved in taking down big prey like kangaroos and sheep. Instead, they look better-suited to catching and killing animals much smaller than the thylacine itself. ... "