There are quite a few Immature Common Terns flying over the lakes in the Parkland now.
I watched these two below (immature in front, adult behind) flying across the the open water at some distance. You may note that the adult has a fish in its beak. You may also see that the immature has its beak open and although I couldn't hear from where I was, it would have been calling.
The immature landed on a bouy and the adult fed it with the fish and I was fortunate to catch that moment, albeit at some distance.
Although poor, here are a few images of adult Common Terns.