Semi-permanent enrichment consists of items that are removable but remain in the enclosure for several months or years usually because of their size, weight, etc.
Fire hoses are hung from the walls and ceiling of the enclosure. They are secured by using clamps or a secure knot. The hoses are strong enough to hold the chimpanzees' weight and withstand climbing and swinging. The hoses' integrity is regularly monitored.
Garden hoses are sometimes tied to the ceiling of the caging. We secure both ends to make a hammock. The hoses must be strong enough to hold the chimpanzees' weight and withstand climbing and swinging. The hoses' are regularly monitored for the chimpanzees' safety.
Tractor tires and car tires are used inside of the chimpanzees' enclosures. Tires are bolted to the floor to stand vertically and some tires are left unattached the chimpanzees may move them around as they wish.
Some tires are used as swings by using secure hosing to tie the tire to the ceiling of the enclosures.
Several cargo nets are used throughout the chimpanzees' enclosure. The nets have been purchased or fashioned by the chimpanzees' human caregivers using fire hoses or pieces of tires. We fasten the four corners of the cargo net to permanent structures in the enclosure. The cargo nets at CHCI are used for nesting and climbing.
The caregivers place wooden or plastic spools in the chimpanzees' enclosure. Some of these spools have been in the enclosures for years and the chimpanzees use them daily as sitting and resting places.
Downed or cut trees are occasionally donated to the Institute and we place them into the outdoor enclosure. The chimpanzees like to forage through the leaves and climb on the tree. The tree may be left in the enclosure for several days before being removed.