From the literature currently in circulation about flight times, it has become apparent that SOME species seem to be emerging earlier than indicated; from Jack's long experience this shift happened quite suddenly in the 1990's. We are talking about 2 weeks earlier on average than the perceived wisdom would indicate - tho's for some species, up to a month...
I say some, because others seem to be around the same times as they have always been.... whites for example...
Is this the experience of others' ?
Which localities and which species have you noticed changes in?
What other factors may have contributed to this?
Maybe we can build up some interesting snapshots from around the country
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