Table 1. Values of auxiliary variables used for the calculation of chimpanzee, ape and elephant abundance [49].

	Chimpanzee	Gorilla	Ape1	Elephant
Proportion of nest-builders	0.83 [56]	0.77 [57]	0.82	–
Nest construction rate/dung production rate (per day)	1.09 [56], [58]	1.0 [58]	1.014	19.8 [59]

¹Values for apes were calculated as weighted averages based on the ratio of number of nests for the two species used in the analysis (chimpanzee: 323, gorilla: 51).