A Comparative Study of Growth Patterns in Crested Langurs and Vervet Monkeys

Table 3

Age classes for crested langurs and vervets.

Langurs		Age classes			Vervets
Crested langur sample size	Age in years^1	Age class	Life stage	Tooth emergence (Maxilla)	Age in years^2	Vervet sample size
2-♂	0–.4	1	Infant	Partial deciduous	0–.3	2-♂
2-♂	.4–1	2		Deciduous	.3–1	2-♂
7-♂	1-2	3	Juvenile	M1	1–2.2	2-♂
3-♂	2-3	4		M2	2.2-3.2	4-♂
3-♂	3–5^3	5		M3	3.2–4.5	3-♂
16-♂	>5	6	Adult	Full (proximal humerus fused)	>4.5	22-♂

¹Based on [49] for crested langurs. Ages are based on gingival emergence times of captured wild crested langurs examined at 3-month intervals, except where noted.
²Based on Fairbanks, pers. comm. Ages are from known-age captive individuals in a vervet colony housed at UCLA-VA Vervet Research Center.
³Based on crested langurs reaching adult physical strength at about 6 years [49], Francois’ langur males reaching reproductive maturity at 5 years [64] as cited in [65] and Phayre’s males reaching adulthood at 5 years [66].