[mou] Possible Thayer's Gull, Sherburne CR2 ponds

[Pastor Al Schirmacher]

Had a possible Thayer's Gull (or hybrid) at Princeton Sewage Ponds along 
Sherburne CR2 moments ago.

Characteristics:

* Classic dark eye (seen several times under good light)
* Light upper chest, darker belly
* Significantly taller than Ring-billed around it
* Pink legs
* However - belly seemed darker than Sibley's second winter gull (but 
nowhere near as dark or extensive as second winter Herring) - and dark spot 
on bill was clearly defined, with bit of yellow tip remaining (more like 
third winter).

Do Thayer's and Herring's hybridize?

If you happen to stop, it is viewable from the parking lot - but take your 
time, there are ~350 RB Gulls present.

Al Schirmacher
Princeton, MN
Mille Lacs & Sherburne Counties