Io9 published a selection of photos of plastic pink flamingos used as mental stimulants for lemurs in the San Francisco Zoo:
Lawn Ornaments Help Lemurs Stay Happy and Healthy
The San Francisco Zoo recently introduced its lemurs to some pink plastic flamingos. The results were predictably adorable, but the flamingos weren’t just decoration. They’re an effort to give the lemurs a bit of mental exercise…. One form of environmental enrichment involves introducing new objects for the animals to explore….
Plastic pink flamingoes came into existence in the twentieth century. The 1996 Ig Nobel Prize for art was awarded to Don Featherstone of Fitchburg, Massachusetts, for his ornamentally evolutionary invention, the plastic pink flamingo. [REFERENCE: Don Featherstone's book Pink Flamingos: Splendor on the Grass]