"The brothers and sisters had contact calls that also had something in common," Berg said. "It makes sense that, if they're learning them from the same two parents, there [would] be some similarities. The end result is that the different nestlings' [vocal signatures] are clearly unique, but it's sort of like they had the same building blocks to work with. So similarities exist at the family level."
Although it has been cited numerous times in captive studies, this amazing display of parrot communication and culture is the first time an experiment has shown that parrots learn in the wild.
"Karl's work is a step towards understanding what may prove to be one of the few communications systems on Earth that rivals our own for complexity," said Marc Dantzker, of the Cornell University Lab of Ornithology.
* Note: The Nonhuman Rights Project does not endorse invasive research or experimentation on captive animals. However, we do quote the results of these experiments when they help make the case that the animals have a level of sentience, self-awareness, and, in some cases, theory of mind, that demonstrates they should not be being kept in captivity in the first place.