3 October 2015. Marmosets to left, Guinea Pigs to right and Farm Barn straight ahead.
Both of the marmosets species are unusual; there are pure Black-tailed Marmosets (most are hybrids), and Western Pygmy Marmosets, which are the only kind of this subspecies on public display in the UK, which differ from the Eastern Pygmy Marmoset (which are more common in the UK, but the Westerns are more common on Mainland Europe).