 The red warbler is an insectivore . It gleans primarily in understory shrubs at low to middle levels , moving slowly and deliberately through more open areas of the vegetation , and feeding with quick jabs into cracks in bark and pine needle clusters . It sometimes hover gleans to feed at pine needle clusters . Though it lacks any obvious adaptations for climbing , it regularly does so in its search for prey items on bark and epiphytes on branches , often hanging head @-@ down as it probes . In areas of deciduous growth , it typically <unk> , making brief aerial sorties from a perch in pursuit of flying insects . While it seldom associates with mixed @-@ species flocks , it feeds alongside other birds with no signs of conflict , displaying no hostility towards other species with which it competes . Its foraging area is quite small , often amounting to only a few dozen square meters ( several hundred square feet ) per day . Late in the afternoon , its rate of foraging declines , and it rests , often taking brief naps , in the forest understory . Though it does not generally feed after sunset , it may do so to take advantage of transient food sources , such as hatching Neuroptera . 
