“…Use of environmental enrichment consistently had a positive impact on welfare perceptions [18, 29, 35, 37, 38, 43, 44, 47, 50, 54, 62, 64, 73, 90, 93, 94, 96, 97, 99–102, 107, 110, 116, 119, 131, 133–139], including feeding-related enrichment [99–102, 136, 138]. Positive perceptions of feeding enrichment are not surprising, as the act of feeding in any circumstance increased welfare perceptions [61, 95, 99, 102].…”