That is a great visual, thanks!
On 3/21/2017 10:05 AM, Frank Fogarty wrote:
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This is a question for which eBird is a great resource. Here's a bar
chart for Richmond and Richmond City generated from the database. If you
haven't used these before, the size of the green box for each week
refers to the relative of the abundance for that species in that week.
For warblers, it shows that the earlier arriving species start to
trickle in around April 1st and that most species have peak numbers in
mid-May. Hope this helps!
http://ebird.org/ebird/barchart?byr=1900&eyr=2017&bmo=1&emo=12&r=US-VA-159,US-VA-760
Frank