The intricate dances performed by manakins in Trinidad are also examined. This phenomenon can be seen with long-tailed manakins, "Chiroxiphia linearis". This occurs with manakins, as well as other birds such as grouse species. Like most manakins in the family Pipridae, they swallow their food whole. Many species of birds, such as manakins and hummingbirds, use sonation for mating calls. Other examples for the sensory bias mechanism include traits in auklets, wolf spiders, and manakins. These manakins eat fruit and some insects. Other examples of the sensory-bias mechanism include traits in auklets, wolf spiders, and manakins. Male club-winged manakins use modified secondaries to make a clear trilling courtship call. Manakins sometimes join mixed feeding flocks. The manakins are a family, Pipridae, of small suboscine passerine birds. Manakins feed on small fruits, berries and insects. The manakins adapted their wings in this odd way as a result of sexual selection. In manakins, the males have evolved adaptations to suit the females' attraction towards sound. Manakins feed on small fruits, berries, and insects.