"Yeah, it kind of has two purposes. So one is a bit of enrichment, so it keeps them busy trying to get their food. And the other one yeah is just to keep them cool in this hot weather we've got.
(Reporter: "And do meerkats normally quite like hot weather?")
"Yeah they do like to sunbathe, but I think this is a little bit too much for them now."
7. Various of meerkats eating ice treats
8. SOUNDBITE (English) Veronica Heldt, zookeeper:
"Yes these guys are from the Kalahari Desert so they are used to fairly high temperatures, but when it does get a little bit too hot they do lie on their stomachs in the shade to try and keep cool. But they do have a great adaptation of an inbuilt pair of sunglasses. They've got dark circles around their eyes which helps a lot on bright sunny days."
9. Zoom in meerkat eating treat out of ice cube tray