Efficacy of foraging enrichments to increase foraging time in Grey parrots (Psittacus erithacus erithacus)

Foraging enrichment is considered one of the most effective strategies to improve welfare and reduce stereotypies and other abnormal repetitive behaviours in captive animals, including parrots. Few studies, however, have investigated the effects of the different types of enrichment and determined their effect on increasing foraging times and foraging-related activities.To study the effect of different types of enrichment on foraging activity, eleven types of foraging enrichment [multiple bowls, mixing food with inedible items, larger-sized food particles, and 8 puzzle feeders] were tested in 12 Grey parrots (Psittacus erithacus erithacus). After acclimatization and assessment of baseline foraging times, enrichments were presented in a random order. Video recordings were used to analyze total foraging times and times spent on the different foraging activities. In addition, the frequencies and duration of foraging bouts, and the times at which they occurred, were determined. The learning curves and presence of habituation to the enrichment over a 1-week period were also assessed.Parrots needed 8.3±1.1 days to learn how to use the foraging enrichments. For two of the puzzle feeders, it took considerably longer. Nine out of eleven foraging enrichments were able to significantly increase foraging times, with the most effective enrichments resulting in a 2- to 2.5-fold increase compared to baseline values (47±18min). The increases in time spent on foraging could be attributed to an increased amount of time spent on enrichment-related activities and/or an increased amount of time spent on food-related activities. None of the enrichments (including the use of multiple bowls in different locations) resulted in significant increases in time spent on locomotory behaviours (i.e. movement towards or away from the feeding site). No significant downwards trends in foraging times were observed over the 1-week observation period. The duration of the observations may, however, have been too short to demonstrate habituation effects.Results of this study show that distinct differences are present in the difficulty level, efficacy and time allocation, thereby affecting the choice for a particular foraging enrichment. Although most of the foraging enrichments were able to significantly increase foraging time, none of the enrichments were able to increase foraging times to levels comparable with that of wild conspecifics (i.e. 4–6hours per day). New, more effective types of foraging enrichment should therefore be developed and tested.