Monday, August 22, 2011

Migration and Owl Monitoring

August 17 to 21, 2011

Sue Ehlmann:

This week, several CoBus members set up Owl listening stations and Migration Monitoring Stations in the foothills west of Loveland and Fort Collins and in the mountains to Walden.

We want to thank the homeowners who allowed us to set up Migration Stations on the roofs of their homes. See "Colorado Field Notes" for directions on how to construct your own (for under $100). Hundreds of hours of recordings yet to be reviewed. There is never enough time.

Owl Listening Stations are a little more mobile and "hands on". Up to eight CoBus members will be monitoring them into September. The goal is to get some understanding of the migration and territories of Northern Saw-whet Owls, Flammulated Owls (late migration date), Northern Pygmy-Owls (territories) and Boreal Owls (territories).

To date 8/15 to 8/20, detections:

Northern Pygmy: 7
Northern Saw whet: 11
Flammulated: 9 (some previous territories have yet to be revisited)
Boreal: 5 (we have been studying their territories for several years and have not returned to some of the more success sites)

Some problems faced included that owls are not as vocal in the fall and in migration. CoBus does not endorse bird banding and therefore, these numbers are relative numbers to past and future studies.

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