Keith here are a few thoughts, when it becomes demonstrable that a species now regularly over-winters here, and it didn't historically, it becomes moot and early/late dates are more or less just that, historical. Generally speaking there are rough dates when some migratory species' populations are considered gone but some "hardy" individuals hang around, such as Gray Catbird. Early/late dates would still be relevant for species such as Whippoorwill, but not so much for some of the species you mention, other than in the historical context. Indeed, about 4 or 5 weeks ago I witnessed a multi-thousand flock of Grackles in Preston. These birds were certainly over-wintering either in CT or very near here. Distribution and migration patterns of many species are continually in flux, and then the complication of population changes gets thrown on top just to make things muddier. The only thing that's constant is change. There, I've ended more or less on an oxymoron.
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Keith here are a few thoughts, when it becomes demonstrable that a species now regularly over-winters here, and it didn't historically, it becomes moot and early/late dates are more or less just that, historical. Generally speaking there are rough dates when some migratory species' populations are considered gone but some "hardy" individuals hang around, such as Gray Catbird. Early/late dates would still be relevant for species such as Whippoorwill, but not so much for some of the species you mention, other than in the historical context. Indeed, about 4 or 5 weeks ago I witnessed a multi-thousand flock of Grackles in Preston. These birds were certainly over-wintering either in CT or very near here. Distribution and migration patterns of many species are continually in flux, and then the complication of population changes gets thrown on top just to make things muddier. The only thing that's constant is change. There, I've ended more or less on an oxymoron.
CONFIDENTIALITY NOTICE: This electronic message contains
information which may be legally confidential and/or privileged and
does not in any case represent a firm ENERGY COMMODITY bid or offer
relating thereto which binds the sender without an additional
express written confirmation to that effect. The information is
intended solely for the individual or entity named above and access
by anyone else is unauthorized. If you are not the intended
recipient, any disclosure, copying, distribution, or use of the
contents of this information is prohibited and may be unlawful. If
you have received this electronic transmission in error, please
reply immediately to the sender that you have received the message
in error, and delete it. Thank you.
