Hapale flaviceps Thomas, 1903, Espirito Santo, Brazil. OTHER COMMON NAMES
French: Ouistiti à tête jaune; German: Gelbkopfbuschelaffe; Portuguese: Sagui-da-serra.
Average weight: 14.3 oz (406 g); head and body length: 8.7-9.8 in (22.2-24.8 cm); tail length: 11.7-13.8 in (29.8-35 cm); Fur appears on the head and ear tufts are buffy-yellowish in color.
Forest remnants in the states of Espirito Santo and Minas Gerais.
Seasonal, altitudinal Atlantic coastal forest. BEHAVIOR
Group size varies between 5-15; a single group that was monitored over six years living together included 11-15 individuals; 3-6 adult males, and 1-6 adult females. Home-range size is around 88 acres (35.5 ha), and daily path length is about 0.75 mi (1.2 km).
Buffy-headed marmosets feed primarily on exudates and insects; exudates are procured through gouging on tree bark. However, they often eat more fruit when it becomes more abundant in their highly seasonal habitat.
Despite the large number of adult females that may live in a group, only one of them breeds. A daughter may inherit the position of the breeding female, while the mother still remains in the group and contributes to infant care, along with other adult and subadult group members. Mating is monogamous, but mating with more than one male (polyandry) is suspected. Two births per year is normal, and probably seasonal.
Endangered. Habitat fragmentation and loss are the major threat.
SIGNIFICANCE TO HUMANS
Often captured for the pet trade; this species is also a draw for ecotourists. ♦
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