Encounters between male chimpanzees from different groups
a. are always friendly.
b. never occur.
c. are frequently accompanied by some form of aggression.
d. only occur at Gombe.
e. none of these
Question 2
Chimpanzee attacks on members of other groups
a. are definitely motivated by territoriality.
b. never result in injury.
c. always occur in the form of displays and nothing more.
d. can be extremely brutal and result in severe injury or death.
e. are so rare that only one or two have been observed.
A male American redstart, Setophaga ruticilla.
Field experiment on effects of predation on male guppy colouration
Calopteryx virgo male
Autonomic innervation of the male reproductive system
Male Reproductive System - Scrotum