Bald-faced hornet to laying eggs while the workers take over all other necessary housekeeping tasks. At some point, sometime before the midpoint of colony life, the colony will begin to invest energy in producing reproductives as well. This marks the transition into the reproductive stage. There is an extensive time period where both workers and reproductives are raised. Production of both castes limits the size of the work force. However, an early switching time is highly adaptive for social wasp colonies in limiting the risk of total loss. In a sampling of 50 colonies taken in Maryland in 1977, workers were produced
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