for a little attention.
I am reading a book and it explains that the difference between mammals and reptiles, is that mammals care about things (their young, their mates) while reptiles could really care less. Mammals then created language to alert when they want more or less attention, or, in the case of the young, are in distress. Birds also have a language. Vultures have a language, I am pretty sure. This has not been covered. They have not said anything about vultures in this book yet.