Bright iridescent colours are widespread in several aquatic and terrestrial animal taxa usually involved intraspecific communication and/or predator avoidance. Camouflage by iridescence may be one strategy to avoid predators when the exhibits bright that match brightness of its surroundings. Hence, structural colouration have a “brightness matching” or “counter-brightness” function observed aga...

The implications of insectsÕ vision for territorial defense have been relatively little studied in the Þeld. In the dragonßy Perithemis tenera Say we investigated whether either the angle at which an intruder was viewed by a territorial resident or the background against which it was viewed affected the detection of that intruder. Residents detected intruders at a greater distance if the intrud...

Abstract Animals that live in hot environments must deal with extreme temperatures and overcome the constraints imposed by overheating. Some species exhibit remarkable adaptations to control body temperature, usually form of structures act as thermal windows cool down dissipating heat. Here, we describe case dragonfly Zenithoptera lanei, which inhabits open areas Neotropical Savannah Amazon. Ma...