Lately the chimps have been out enjoying the sunshine, but when they're not catching rays, the zoo team provide heated dens for them to shelter in.
For the cotton-top tamarins, there is a small shelf behind a clear pane of glass, so visitors can watch them huddle under heat lamps.
"They prefer that over going into their den during the day because they like to see what's going on, like to see visitors going past and interact with them," Neale said.
Spider monkeys huddle together in their enclosure at Wellington Zoo. Photo / Mark Mitchell
The otters are the same - they are more than happy to pile up on their heated rock under the delighted gazes of the zoo's guests.
Other animals, such as the squirrel monkeys or the white-cheeked gibbons, like to lounge in the sunshine when it's out.
The squirrel monkeys will often choose a sunny spot over their heated dens, Neale said.
When the animals aren't warming themselves under the sun or on their heated rocks, keepers are providing enrichment in the form of warm balls of porridge.
Spider monkeys wait for their warm porridge to be thrown to them at Wellington Zoo. Photo / Mark Mitchell
"Porridge is a good one a lot of the animals like here. Over summer we freeze it and make it kind of more like an iceblock."
In the summer, the zoo also uses frozen blocks of blood, wheelie bin-sized chunks of ice, and Warehouse paddling pools to keep the animals cool.
