Yes, tent tree or maybe forest tent caterpillar, or some similar Lepidopteran 
that lays a compact mass of many hundreds of eggs that all hatch simultaneously 
like those in the photo. Food for Cuckoos, but probably not Prothonotary 
Warblers.

-Geo

> On May 18, 2020, at 9:20 AM, Marie P. Read <m...@cornell.edu> wrote:
> 
> 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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