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• ~~'iole~ green swallow. The violet-green swallow was the ~~..rorx? :!usl :!~u11.:~UlL °~~cies obser~,•ed (average abunc'.ance of 6.0 individuals,^,c~). This species wRS also observed in all five vegetation types and was •,he 5eccnd ni,st al,wi- dant species observed in the alfalfa field, grassland,~~asture, juniper and sage- brush types. !:owever, in all instances, this species was observed as a "flyover", `oraging on the f'_ying sects above each vegetation tyae. Since the study area i s s:~all and the xsserine transects were placed within ~: ^iile of each other, the same individuals were probably observed over each vegetation type. Thus, t`:e relative abundance indices for the violet-green syrallow may be ir_°lated. The violet-green swallow exhibited a definite affinity for the alfalfa field. Car^non craw. '?'.tie comrion craw was the third most abundant species observed. P,1_heuoh the cro~-^nn crow was rot found in high numbers in any habitat type (1.5 individua'_s/lan over all trensects), it did have a wide distribution ar:~ong habitats in the study area. It was found in all vegetation types but as a result of the low number of observations, an affinity for any one habi- • tat was rot apparent. Crows, like red-winged blackbirds, tend to occur in `locks. i;estern meado4:_ark. The western meadowlark is a year-round resident of the study area and was t'~e f°eu_~tn Trost abundant species observed during the breed- ing bird surveys, averacing 1.5 individuals/]an over all types. This species was observed in the alfalfa field, grassland, pasture, and juniper habitats and ex}i!cited an affinity for the juniper type. A'i~ter Passerine Habitat. A total of six avian species were observed during the winter passerine surveys in the Nucla study area. The four passerine species in decreasing order of relative abundance were: white-cra,•med s:~a_-row, Oregon june~, western meadowlark and raven. Non-passerine species observed durine the winter tra_zsects were the marsh hawk and ring-necked pheasant. Riparian. fibre passerine species were observed in the riparian tyre than . any other type surveyed during the winter passerine surveys (4). A.ccorcLngly, this type had the highest species diversity index of any type surveyed (0.91). '"'.pis habita*_ also s.:rrorted the highest avian population (90.7 individuals/ -34- o u ~ 1 1 1960.