Chap. III. 
MORAL SENSE. 
75 
animals perform many little services for each other: 
horses nibble, and cows lick each other, on any spot 
which itches : monkeys search for each other’s external 
parasites ; and Brehm states that after a troop of the 
Cercojoithecus griseo-viridis has rushed through a thorny 
brake, each monkey stretches itself on a branch, and 
another monkey sitting by “ conscientiously” examines 
its fur and extracts every thorn or burr. 
Animals also render more important services to each 
other : thus wolves and some other beasts of prey hunt 
in packs, and aid each other in attacking their victims. 
Pelicans fish in concert. The Hamadryas baboons turn 
over stones to find insects, &c. ; and when they come to 
a large one, as many as can stand round, turn it over 
together and share the booty. Social animals mutually 
defend each other. The males of some ruminants come 
to the front when there is danger and defend the herd 
with their horns. I shall also in a future chapter give 
cases of two young wild bulls attacking an old one in 
concert, and of two stallions together trying to drive 
away a third stallion from a troop of mares. Brehm 
encountered in Abyssinia a great troop of baboons which 
were crossing a valley : some had already ascended the 
opposite mountain, and some were still in the yalley : 
the latter were attacked by the dogs, but the old males 
immediately hurried down from the rocks, and with 
mouths widely opened roared so fearfully, that the dogs 
precipitately retreated. They were again encouraged 
to the attack ; but by this time all the baboons had re- 
ascended the heights, excepting a young one, about six 
monkeys extracting thorns from each other, see s. 5t. With respect to 
the Hamadryas turning over stones, the fact is given (s. 76) on the 
evidence of Alvarez, whose observations Brehm thinks quite trust- 
worthy. For the cases of the old male baboons attacking the dogs, see 
s. 79 ; and with respect to the eagle, s. 56. 
