Hello Al, as You said the aim of this project is basically to find out which combination works and which doesn't I am trying to share some information from this aspect.
Many interesting ethological reports origin from the mixing of Giant Anteater. Almost all of the mixed species exhibits with them worked without major problems and especially the Anteaters are the active initiators of interspecific and friendly contacts. There were many close social contacts between Anteaters, Capybaras and South American Tapirs, whereby those were intensively licked on the ears, anogenital region and on the skin, and the recipients obviously enjoyed it. One of the closest contacts were observed in Dortmund Zoo where an Anteater was drinking milk from a lactating female Tapir. Despite all that, Copenhagen Zoo reported a „hunting behaviour” of the Giant Anteater: more than once young Patagonian Cavies which were not quick enough to hide in their burrows were caught by the Anteaters. The same situation were observed in Tiergarten Schönbrunn and Munich Zoo, where the Anteaters learnt how to dig the young Patagonian Cavies from their burrows.
Many combination develeoped with them in zoos so far, some of these which have not been mentioned yet: with Brocket Deer and with Pudu, or with an other Anteater species, like Tamandua sp.
One of the interesting combinations developed with Sloths in Tiergarten Nürnberg, where kept them together with Manatees. Sloths mostly ignore other animals. Keeping them together with various species of monkeys can be a problem, as the primates always trying to steel the sloths’ food. At the moment we keep our Sloth together with Red-bellied Tamarins and with a Six-banded Armadillo. The Armadillo brings up a hygienel problem, as it loves to dig the faeces (its own and from the sloths’ as well). Sloths can be kept together with various species of birds. Halle reported a problem keeping Sloths together with Finches: the birds did want the long hair for nesting. Halle has had an other mixing in the past, Hoffmann’s Two-toed Sloths together with Mountain Viscacha.