These two macaques were held in a screened-off exhibit next to the mangabeys. Remembering the Assam Macaques from my 2003 visit my zoo-sense was tingling, so I made sure I got a photo. Checking ISIS, except for the 80-plus group of Japanese Macaques on their rock, the zoo is listed as holding:
0.1 Assam Macaque (Macaca assamensis)
0.1 Northern Pig-tailed Macaque (Macaca leonina)
Now, the Assam-typical slightly orange/golden colouration of the left-hand animal and the flattened facial features of the right-hand animal would suggest that these are those two animals, which if so makes this only my second time of seeing Assam and my very first of seeing Northern Pig-tailed (as opposed to the slightly more often-kept Southern, M. nemestrina).
Is anyone able to confirm these IDs are correct?