the diet of geoffroy's tamarin is similar to some species of tyrant flycatcher birds in panama, and they share similar vocalizations. the tamarins may use the flycatcher calls to help find favorable food sources. the flycatchers and tamarins have different patterns of activity, which minimizes competition for similar food sources. the flycatchers are most active shortly after dawn and tend to rest in the middle of the day. the tamarins do not become active until about 45 minutes after full daylight, but remain active for most of the remaining daylight hours until an hour or less before sunset.