Table 1. Characteristics of the groups and habitats of black howler monkeys that were studied in unprotected and protected areas in Campeche, Mexico.

	Unprotected habitat			Protected habitat
	Álamo	Chicbul	I. Gutiérrez	Calakmul	Términos
Area (km2)	0.96	0.05	0.02	7231.9	7061.5
Distance to nearest village (m)	1,640	771	1,092	27,000	18,100
Population density (ind/km2)	52	120	63	15.2	19.2
Group size *	6.4	7.7	6.7	7.3	7.3
Number of adult males *	1.5	1	2	2	1
Number of adult females *	2	2	3	1.5	3
Sampling months (dry/wet season samplings)	January/August	January/August	March/July	February/August	February/July

*Calculated as mean number of individuals during the two sampling periods (i.e., rainy and dry season).