need burrows or nesting boxes to sleep/nest in. The
furnishing of an enclosure should consider all aspects
of an animals’ natural behaviour. One animal might be
eager to dig while another animal likes to take a bath
or mud pool. A zoo should provide for these needs, so
that the animal can live in the zoo in more or less the
same way it would in the wild.
Drainage is important in outside enclosures. Animals
with hooves (ungulates) can seriously damage the soil
they walk on, preventing any vegetation from growing.
There are several techniques to prevent the enclosure
from becoming a mud pool (e.g. drainage by using
layers of different soils in substrates)