is important to develop appropriate environmental enrichment programs that can be effectively carried out with the size of staff and time available. References External links Laboratory Animal Refinement Database Animals in Laboratories (awionline.org) 3R Research Foundation Switzerland (forschung3R.ch) Environmental Enrichment, Animal Welfare Information Center The Shape of Enrichment selected articles on enrichment for zoo animals. Environmental Enrichment for Pet Cats (ASPCA) Environmental Enrichment for Pet Dogs(ASPCA) Environmental Enrichment for Horses(ASPCA) Animal welfare Ethology Zoos