Geo, do you think they're tent caterpillars? That's what I thought...
Marie

Marie Read Wildlife Photography
452 Ringwood Road
Freeville NY  13068 USA

e-mail   m...@cornell.edu
Website:     http://www.marieread.com

AUTHOR of:
Mastering Bird Photography: The Art, Craft, and Technique of Photographing 
Birds and Their Behavior

https://rockynook.com/shop/photography/mastering-bird-photography/?REF=101/
________________________________________
From: Geo Kloppel [geoklop...@gmail.com]
Sent: Monday, May 18, 2020 9:12 AM
To: Marie P. Read
Cc: Whitings; CAYUGABIRDS-L
Subject: Re: [cayugabirds-l] Prothonotary Warbler

It looks like there was an egg mass right on the box, and they’ve all just 
hatched. Be climbing the trees soon.

-Geo

> On May 17, 2020, at 6:59 PM, Marie P. Read <m...@cornell.edu> wrote:
>
> Hi Diana and Cayugabirders,
>
> Here is what birdsoftheworld.org (formerly Birds of North America online) 
> says about Prothonotary Warbler nesting:
>
> <Nest Site
> Selection Process
> Males establish territories around one or several suitable nest sites, and 
> place moss inside cavities before females arrive. Male displays at each 
> cavity. Female selects nest cavity from among those available. Settlement by 
> female is related partly to quality or number of nest cavities available>
> and
> <Nest
> Construction Process
> Male places moss in potential nest sites. Amount of moss varies from several 
> pieces to foundation 1–8 cm deep, and male may fashion nest cup in moss. 
> Female alone constructs remainder of nest and lining, with male accompanying 
> but not assisting. >
> and
> <Nonbreeding Nests
> Males place various amounts of moss (but not complete nests) in all available 
> cavities within their territory.>
>
> No mention of larvae. I can't quite tell what kind of larvae they are from 
> the one photo I can see on your site. But very interesting observation. I 
> didn't notice anything like this obvious new hatch of larvae on the 3 boxes I 
> observed there last week at Armitage Rd. I also saw/heard at least 3 
> different males along the road.
>
> Marie
>

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