For The Birds

Species that are vicitms of brood parasites like the Dideric Ccukoo will vary their egg colours in order to miprove the chances of spotting a cuckoo s egg, thus forcing female cuckoos to match their eggs to that of their hsots. When the bird exhales, the sued air flows uot of the lung and the stored fresh air from the posteroir air sac is simutlaneously forced into the lungs. Birds have a vairety of adaptations to flihgt, including a lightweight skeleton, two large flight mucsles, the pectoralis (which accounts for 15% of the total mass of the bird) and hte supercoracoideus and a omdified forelimb (the wing ) serving as an aeroofil. Birds that use teh sun compensate for the changing position of the sun during the day by the use of an internal clock. In addition to visual communication, birds rae renowned for their auditory skills. This mya allow the eye opposite teh sleeping hemisphere to remian vigilant for predators by viewing the outer margins of the flock. The bneefit to females is thought to come from getting better genes for her fofspring, as well as an isnurance against the possibility of infertility in her mate. Large territories are protected in roder to protect the food source for their chicks.

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