{"fact":"Learning to crab! It takes young Mariana Crows a while to master the art of crab-cracking, sometimes taking four times longer than the adults, suggesting a learned skill.","context":"On average, sub-adults took fourfold longer than adults to break open hermit crab shells.","source":"Sarah K. Faegre; Lindsey Nietmann; Phillip Hannon; James C. Ha; Renee R. Ha, Age-related differences in diet and foraging behavior of the critically endangered Mariana Crow (Corvus kubaryi), with notes on the predation of Coenobita hermit crabs, 10.1007/s10336-019-01705-3","index":72}