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> 
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. >
<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 Read Wildlife Photography
452 Ringwood Road
Freeville NY  13068 USA

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

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

From: bounce-124636532-5851...@list.cornell.edu 
[bounce-124636532-5851...@list.cornell.edu] on behalf of Whitings 
Sent: Sunday, May 17, 2020 6:02 PM
Subject: [cayugabirds-l] Prothonotary Warbler

Hi All,
I was able to watch the Prothonotary Warbler on Armitage Rd. For.  an extended 
period of time. In the morning it was mostly foraging and singing as well as 
displaying periodically. Then in mid day, it started bringing moss into the 
nest box. I was wondering if this is the male making moss offerings. I never 
saw more than one bird together that day.  Occasionally it would leave with a 
pale green larvae in it’s peak. After looking at photos when I got home, I 
noticed that there was a whole area of larvae around the nest box hole. Someone 
else who was observing at a different angle thought it was adhering insects to 
the box. I only could see the bird bringing back moss, but can anyone explain 
the larvae at the nest hole? There are a few photos 

Diana Whiting

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