These 2 are located in the former bobcat enclosure. Also I can tell they are males because as they get older they grow more aggressive towards not only other lemur species, but also female Black & White Ruffed Lemurs.
Hamilton Zoo has 4.2 Black and white ruffed lemur:
1.0 Mikaly (2008)
1.0 Ankoto (2012)
1.0 Sambava (2012)
1.0 Vazimba (2016) Sambava x Ayana
0.1 Ayana (2010)
0.1 Vezo (2016) Sambava x Ayana
At the start of the year, the two females were in this exhibit; but this may have changed, as I didn’t see any Black and white ruffed lemur in with the Ring-tailed lemurs.
