Species status of the black howler monkey,Alouatta pigra, of Belize
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- Horwich, R.H. Primates (1983) 24: 288. doi:10.1007/BF02381092
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Small troop sizes which averaged 5.23 members per troop and the early descent of male testes inAlouatta pigra show a marked difference fromA. palliata. These differences strengthenSmith's (1970) observations of morphological differences betweenA. pigra andA. palliata.