I didn't see them in the monkey house yesterday. I knew they were there so I was surprised not to see any. I didn't see signage of them either, or an empty enclosure. All I saw there were the indoor enclosures for monkeys (colobus, black macaque, howler, 4 species of guenon, mangabey and mixed enclosure for saki/marmoset/tamarin), the free-ranging sloths and an enclose for echidna and giant flying squirrel. Where exactly in the monkey house are they supposed to be?
As I recall when I visited they were at the end opposite from the largest enclosure, roughly opposite from the echidna and flying squirrel. But that was almost two years ago now, so someone else probably has more recent information.