Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Mean object manipulation rates in bouts/hr (SD) for immature bonobos (left) and chimpanzees (right) in two age classes (<3 yrs old = grey, >3 yrs old = white). * Independent Samples T-test: P < 0.05
