Environmental enrichment: wide range of modifications to the environment of captive or farmed animals that offer adequate stimulation and facilitate the expression of highly motivated behaviour thus promoting positive emotions and improving animal welfare. Environmental enrichments can be classified into five (non-exclusive) categories, i.e. feeding, occupational, physical, relational and sensory enrichments. See reviews on enrichment produced by EURCAW Ruminants & Equines for detailed definitions: https://www.eurcaw-ruminants-equines.eu/welfare_topics/enrichment/