Common tern ,immature.

Erieau, Ontario, Canada, Aug 17, 2021.


Seen for the pontoon boat.

Sterna hirundo
Just like adding sandbags to prevent your home from flooding, Common Terns quickly add vegetation, bones, shell fragments, and anything else they can collect to raise their nest if it is threatened by high water.
Source -Cornell Lab of Ornithology- All About Birds

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