The 'less-is-better' effect in capuchin monkeys (Sapajus sp.): some data and a contrast-like hypothesis
{{output}}
Given a choice between a simple option offering a preferred-food item (e.g., a grape, G) and a combo option offering the same preferred-food item plus a less-preferred food item (e.g., a grape + a slice of cucumber, GC), animals often behave suboptimally by ei... ...
