I'm not entirely sure why the Terns do this, I guess it's a form of pair bonding. One bird will fly to a high altitude while being chased from below by a second bird, presumably of the opposite sex. There was a small Tern colony in the lake this year and so the birds were busy fishing and chasing one another while taking care of young ones at the time these shots were taken. Courtship would have ended by this time since birds had already paired off.
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