Main content
Grin and grimace
Primatologist Dr Louise Barrett of the University of Liverpool explains why colour vision was so important to monkeys that were active during the daytime and describes what facial expressions mean in the monkey world.
Duration:
Featured in...
![]()
麻豆官网首页入口 Nature
Be captivated, informed and inspired by the world's wildlife.
More clips from The Beasts Within
-
![]()
Helpful heritage
Duration: 03:54
-
![]()
Brain or brawn
Duration: 01:37
-
![]()
Fossil whodunnit?
Duration: 04:30
-
![]()
On two feet
Duration: 04:16
