For anyone interested in simply seeing a bird of this type, there is currently 
one on the beach at Nickerson. Also present are at least 4 Roseate Terns, and 
many young Common Terns. 

> On Jun 14, 2018, at 20:51, Joseph DiCostanzo <jdic...@nyc.rr.com> wrote:
> 
> I just wanted to add some information to my comments about variation in 
> individuals. I looked at data from Common Terns trapped on Great Gull Island 
> in the summer of 2017. We have weights on 918 individuals. The weights ranged 
> from 99.1 grams to 158.9 grams. That means at the extremes, the largest birds 
> were 60% more massive than the smallest birds. That kind of difference is 
> likely to be noticeable in the field. And that difference is not between 
> different subspecies or populations, but within a single colony.
> 
> I should point out that these 918 birds were nearly all trapped on nests, so 
> they are healthy birds. Also the birds at the top and bottom of that range 
> were not extreme outliers. At both extremes, there were numbers of 
> individuals within 10 grams of those lowest and highest weights. For the 
> statistically minded, the average weight was 126.0 grams and the standard 
> deviation was 9.45.
> 
> Joe DiCostanzo
> 
> Sent from my iPad
> 
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