They typically screech loudly when they are defending their young. Screech owls often hunt their prey from tree perches and consume a varied diet that includes mice, birds, insects, earthworms and crayfish. They build their nests in hollow trees, tree stumps and hollow trunks.
Medical Definition of TSETSE FLY. : any of several dipteran flies of the genus Glossina that occur in sub-Saharan Africa and include vectors of human and animal trypanosomes (as those causing sleeping sickness and nagana)âcalled also tsetse.ull Definition of TSETSE FLY. : any of several dipteran flies (genus Glossina) that occur in Africa south of the Sahara and include vectors of human and animal trypanosomes âcalled also tsetse â compare sleeping sickness. See tsetse fly defined for English-language learners. See tsetse fly defined for kids.
In the first cross you are given there is a single mutation. Anesthetize the flies using ether (your instructor will demonstrate). Observe them carefully under the dissecting microscope and record your observations in your lab notebook. The first step is to identify the sex and type of fly  mutant or wild type.or example, the mutant ebony has a much darker body than the wild type fly. Each mutation is also given a letter code. Thus, in the case of ebony, the code is a lower case e. The wild type fly is denoted by a superscript + over the mutant letter code.