10 23 26 Friday
In this post, Bill speaks of Sharp-shinned Hawks diving on other Hawks. This is a behavior we often see when migrating hawks pass over the breeding territory of local hawks. The local birds tends to shoo them on through. Not generally excessively threatening. but just enough to say, when you come back this way in spring, remember this is MY territory. But interestingly enough, that doesn't mean that we have mixed kettles or multiple close kettles of differing birds attacking each other the whole way. In fact it is not abstract to look up to find a mixed kettle gladly sharing a lift of air, to make the next glide from heights to miles away a little easier for all involved.
Bill also mentions the barometric pressure went down. Through the years, it had become obvious at some point to record keepers that when the barometric pressure dropped and generally approached 30 or below. some good flights have arrived. We have discussed that it may have a lot to do with this lift thing. Birds can come from heights as the barometer falls. because there is an actual something happening in the air around us, when is the life's blood of migration. Where columns of air provide lift, is the trail most migrants prefer for the greater part of their trek. There will always be a bit of weather data on Bill's report, and seeing the correlation through the day is often an interesting thing.
Here's the report:
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