The infra-red (IR) landscape of Triatoma infestans. An hypothesis about the role of IR radiation as a cue for Triatominae dispersal

► During the first hours after dark the thermal contrast between hosts and their landscape rises. ► In the IR band, the potential host discrimination by vectors fits well with their sensory capacities and dispersive behavior. ► Dispersal would be favoured in periods of low atmospheric water saturation when IR perception is highest. ► Some building materials, can retain high temperatures during the night, which might add attractiveness to the presence of hosts.