Bubo virginianus

Mirex residues in 20 great homed owls (Bubo virginianus) found dead or dying in New York state in 1980 to 1982 contained concentrations of mirex and PCBs higher than those reported for great homed owls elsewhere (Stone and Okoniewski 1983). Owls in poor flesh contained higher residues than those in good flesh these values were 6.3 mg/kg FW vs. 0.07 mg/kg FW for brain, and 5.6 mg/kg FW vs. 0.1 mg/kg FW for liver (Stone and Okoniewski 1983). Waterfowl collected from upstate New York between 1979 and 1982 had about 0.07 mg mirex/kg FW breast muscle and 0.28 mg/kg FW subcutaneous fat (Kim et al. 1984, 1985). 

The first chlordane-related mortality was of three wild birds and was recorded between 1978 and 1981 (Blus et al., 1983). The levels of chlordanes and heptachlor epoxide from the two adult male red-shouldered hawks (Buteo lineatus) and an adult female great horned owl (Bubo virginianus) were within the critical lethal range that has been defined by experimental studies (heptachlor epoxide in brain tissue 3.4-8.3 pg g-1 wet wt. oxychlordane in brain tissue 1.1 5.0 pg g-1 wet wt.). The chlordane poisoning of birds has been reported in several studies in the United States (Blus et al., 1983, 1985 Post, 1951 Stansley Roscoe, 1999). From 1986 to 1990, 122 cases of avian mortality due to chlordane and/or dieldrin were documented in New York, Maryland and New Jersey (Okoniewski Novesky, 1993). High pesticide concentrations were found in cyclodiene-resistant insect populations. These pesticide-tainted insects, when eaten by birds, caused mortalities in the avian populations (Okoniewski Novesky, 1993). 

There are 17 species of typical owls breedir in North America. The largest species is the great homed owl Bubo virginianus), with a body length of about 20 in (50 cm). This is a widespread and relatively common species that occurs almost everywhere but the northern tundra, feeding on prey as large as hare, skunks, and porcupines. The smallest species of owl in North America is the previously mentioned elf owl. 

Andean goose Chloephage melanoptera Great homed owl Bubo virginianus... 

Eagle-owl, Bubo bubo, 437 Eastern screech-owl, Otus asio, 359 Great homed owl. Bubo virginianus, 119,283, 287, 291,514,799... 

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