Maybe this is relevant: another effect that strengthens the anti-predation
function of a herd is the "confusion effect" of many similar animals milling
quickly about so the predator cannot fasten on any one. This is easy to
demonstrate with a computer simulation and one reason that strong sex
Hi Wesley, you wrote:
> I'd actually expect the opposite: something that's called a "selfish herd"
> effect, where the larger the group, the less likely that you'll be depredated
> because by chance alone you're far less likely to be killed by the small
> number of predators in the area if you'
I agree. I had 150 or so last Wednesday at my feeders. Now I have none! Feeders
are full!
From: Christopher Wood
To: Geo Kloppel
Cc: cayugabirds-l
Sent: Wednesday, January 9, 2013 10:16 AM
Subject: Re: [cayugabirds-l] 100+ Redpolls-for a minute
I also
In the last week of Dec and on the CBC count day, I carried out a number of
stationary counts from a parking lot at IC to see what was moving in the
mornings. There was regular southbound passage of redpoll flocks, at least
in the first two hours of daylight. For example, on Jan 1 I had three
Christopher Wood
Sent: Wednesday, January 09, 2013 10:17 AM
To: geoklop...@gmail.com
Cc: CAYUGABIRDS-L
Subject: Re: [cayugabirds-l] 100+ Redpolls-for a minute
I also think that many of these redpolls are still actively moving.
These birds may have come in, fed briefly and then taken off for some plac
Chris Wood wrote:
> I also think that many of these redpolls are still actively moving.
No doubt. After having 75-100 at my feeders for a number of days running,
yesterday I suddenly had 200. And today I'm back to the smaller numbers.
Geo
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7014?mt=11
From: bounce-72567911-5851...@list.cornell.edu
[bounce-72567911-5851...@list.cornell.edu] on behalf of Christopher Wood
[chris.w...@cornell.edu]
Sent: Wednesday, January 09, 2013 10:16 AM
To: geoklop...@gmail.com
Cc: CAYUGABIRDS-L
Subject: Re: [cayugabirds-l] 100+ Redpolls-for a
I also think that many of these redpolls are still actively moving.
These birds may have come in, fed briefly and then taken off for some
place a hundred miles away. While we often think of migration being in
May and September, there probably isn't a single month of the year
where at least some ind
This is from the BNA article on Carolina Chickadees, supporting Geo's
observation:
Winter flocks move horizontally at an average rate of 6 m/min, with a daily
pattern of rapid movement in early morning (07:00–10:00: 8 m/min) and in late
afternoon until roosting (15:00–19:00: 7 m/min), with slowe
Hi Laura,
When gathered in large flocks they actually strike me as being _more_ skittish;
perhaps it's a compounding effect. Makes sense in a way. There may be no
predator around at the moment, but they know that by concentrating at a rich
food source in a landscape of scarcity they create a m
Hi,
This morning there was a flock of at least 100 Redpolls in the trees near our
feeders. A few were at the feeders, but after sticking around for a few minutes
they alldisappeared. Here's a question - why would they leave a rich food
source? Our feeders are full, there are 7 to choose from,
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