Many of the animals on the estate roam on rolling hills enclosed with wooden fences. The swans and capybaras — the world’s largest rodent — lounge on the bank of a pond among scattered landscaped trees and stones. Some of the more carnivorous animals do live in cages – like a group of serval cats – though the enclosures lead out to small, separate fields. The marmosets, a New World monkey species, live in tall, rectangular cages with a complex branch infrastructure tailored for climbing. Birds flit and perch inside an aviary.