Preliminary Evidence of Material Culture in the Critically Endangered Pygmy Raccoon (Procyon pygmaeus)

Animal material culture is most often discussed in relation to tool use and foraging, while non-foraging object use remains poorly documented in many taxa. This study reports opportunistic observations of a novel object-directed behavior in the critically endangered pygmy raccoon (Procyon pygmaeus), an island-endemic species restricted to Cozumel, Mexico. During fieldwork on tourism effects between January and February 2026, researchers used direct observation, site assessment, photography, videography, and interviews to document raccoon behavior at several sites. At one beach club, two juvenile female siblings were observed retrieving paper waste, dipping it in water, rolling and compacting it with sand, and using the resulting balls in play. One juvenile first performed the full sequence while the other observed and then attempted the behavior; the second juvenile later completed the sequence independently after her sister had been removed from the site. However, at a comparable tourism site with juvenile raccoons and access to paper and water, this behavior was not observed. These observations provide potential evidence of socially mediated material engagement in pygmy raccoons. The findings expand the known behavioral repertoire of the species and support continued field-based behavioral monitoring, especially where tourism, waste exposure, and juvenile development overlap.