NIGHT MONKEYS AND TEETEES 
scarlet face, which in one — the bald ooakari — extends into 
a very high forehead; but this one has a black face. All are 
diurnal, scrambling about the high tree tops of the forests of 
the upper Amazons, and nowhere numerous. 
Still another group embraces the related night monkeys, tee- 
tees, and squirrel monkeys. All these are “small and elegant 
animals, covered with long hair, and having long, night 
bushy tails, which are not prehensile, although they Moneys: 
can be curled around a branch.” The night monkeys, owl 
monkeys or douroucolis (Nyctipithecus), have a short, thick 
body, clothed with prettily varied fur, a round head and round- 
ish face encircled by a whitish ruff; and their enormous yellow 
eyes, betokening their nocturnal habits, give an owlish expres- 
sion to the countenances. ‘‘They sleep all day long in hollow 
trees,” to quote Bates again, “‘and come forth to prey on insects 
and fruits only in the night; . . . [and] are aroused by the least 
noise, so that when a person passes by the tree in which a num- 
ber of them are concealed, he is startled by the sudden appari- 
tion of a group of little striped faces crowding a hole in the 
trunk.” Alston ‘* was informed that the Central American 
species (NV. érivirgaius) lived in small parties or families which 
remained concealed in the tops of the trees during the day, 
often hidden in heaps of sticks and dead leaves which are per- 
haps collected by themselves. At nightfall they come forth to 
feed, but seldom seem to wander far, returning regularly to the 
same places, especially in search of the fruit of the guava. Dur- 
ing the darkness they continually utter a low cry sounding like 
douroucou, feebly pronounced. They are not often kept as pets, 
but are interesting and gentle when carefully treated, as may 
be seen by reading the experience of Olive Thorne Miller, 
related in Harper’s Magazine for July, 1886. The cries of all 
these night monkeys are like those of a cat, and they hiss when 
angry. 
The teetees (Callithrix), on the other hand, although differ- 
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