Once the eggs are hatched, parents work overtime trying to get all their little ones fed. But how do hatchlings make sure they get enough to eat? They use their beaks and a good set of pipes! Some bird species, like the Jackson’s Golden-Backed Weaver, are able to tell one chick’s call apart from the others. And juuuuuust in case the parents aren’t listening, the hungrier a chick gets, the longer and more high pitched its calls become.