Bald-faced hornet hydrocarbons serve as a barrier to moisture diffusion and thus prevent dehydration in wasps. Cuticular hydrocarbon profiles vary over species and nests, and so cuticular hydrocarbons are a proposed mechanism for nest-mate recognition. Worker and queen cuticular lipids have similar components, but their distributions differ dramatically, implying that cuticular hydrocarbons also play a role in caste differentiation. The following lipid profiles were determined from specimens collected in the summer and early fall of northeastern Georgia in 1989. The dominant hydrocarbons recovered from the cuticles of workers were n-alkanes and methyl branched and dimethyl branched alkanes with a C27 or a
Black-faced woodswallow cessation of woodswallow decline.Storm-burning has produced a more open vegetation structure, which is beneficial for insect feeding and nesting by the woodswallows. Storm-burning is therefore thought to be essential for persistence of black-faced woodswallow habitat in the Cape York Peninsula. This also assists golden-shouldered parrot conservation by reducing their predation risk. Black-faced woodswallow The black-faced woodswallow ("Artamus cinereus") is a woodswallow. It is long. It is the most widespread species in the family Artamidae, living in Australia, New Guinea and the Sunda Islands, including Timor. The black-faced woodswallow is in length, and weighs . It has a blue-grey beak with