Bird calls tend to be unmusical, acoustically simpler,
and less complex than the proclamatory songs, and they
serve a variety of practical, non-sexual functions.
Most have to do with coordinating behavior among other
members of the species. Types of calls include location
calls (to communicate whereabouts between pairs or
among members of a flock), warning sounds, sharp notes
to intimidate or drive away enemies (the braying of a
scrub jay), and begging pleas.