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Mealworm feeders as environmental enrichment for common marmosets
S Vignes1, J D Newman, R L Roberts
1Laboratory of Comparative Ethology, National Institute of Child Health and Human Development, National Institutes of Health, Poolesville, Maryland 20837, USA.
Abstract:
The impact of a foraging enrichment device, the "mealworm feeder," on the behavior of the common marmoset was examined. In 3-h weekly exposures to the wormfeeder device, behavioral observations were conducted to compare the rates of feeder use, use of other enrichment devices, stereotyped behavior, and inactivity, to those of control sessions in which the enrichment device was not provided. Significantly decreased rates of pacing and time spent sitting still were observed in association with placement of the mealworm feeder. Feeder use declined over a period of 3 h, even if the feeders' contents were not fully depleted, and the effects of enrichment on activity waned in a like fashion. Use of other enrichment devices, comprised primarily of cage furniture, increased in the presence of the mealworm feeder. This effect did not change significantly over the 3 h of exposure even though use of the feeder declined. There was significant variation in feeder use among sex and housing condition, with females housed singly and in peer groups using the feeders significantly more than did males, whereas subadults used the feeder significantly more often than did either the dominant female or male in family groups. The results of this study suggest that the mealworm feeder is an effective form of environmental enrichment for the common marmoset, but interest wanes after approximately 3 h.
Insights
The mealworm feeder effectively enriches the environment for common marmosets, reducing pacing and inactivity. However, their interest in this foraging enrichment wanes after about 3 hours.
Area of Science:
- Primate behavior
- Animal welfare science
- Behavioral enrichment
Background:
- Environmental enrichment is crucial for captive primate welfare.
- Foraging devices can mitigate abnormal behaviors in primates.
- Common marmosets (Callithrix jacchus) exhibit specific behavioral needs.
Purpose of the Study:
- To evaluate the impact of a novel foraging enrichment device (mealworm feeder) on common marmoset behavior.
- To compare behavioral changes during exposure to the feeder versus control conditions.
- To assess the duration of effectiveness and factors influencing feeder use.
Main Methods:
- Weekly 3-hour exposures to the mealworm feeder device.
- Behavioral observations recording feeder use, other enrichment use, stereotypy, and inactivity.
- Comparison with control sessions without the feeder.
- Analysis of variation in feeder use based on sex and housing.
Main Results:
- Significantly decreased rates of pacing and inactivity were observed with the mealworm feeder.
- Feeder use and enrichment effects on activity declined over the 3-hour exposure period.
- Use of other enrichment devices increased in the feeder's presence.
- Females and subadults showed higher feeder utilization than males and dominant individuals.
Conclusions:
- The mealworm feeder serves as an effective environmental enrichment for common marmosets.
- The positive behavioral effects of the feeder diminish after approximately 3 hours.
- Individual and social factors influence the utilization of foraging enrichment devices.