Although I may have spent the first few posts talking about songbirds and gulls, terns are our focus around here. These feisty seabirds are what bring us to Metinic, so it’s high time I let them have their “tern” as the center of attention.
Metinic’s terns, both Common and Arctic, had a rough season last year. Because of an unfortunate combination of bad weather and lots of egg-eating gulls, the terns were forced to abandon their nests shortly after they began laying eggs.
We were all holding our breath to see if the terns would take a chance on Metinic again this year. Even if they did, we had no idea how many would actually return.
After completing our annual tern census this week, we’re pleased to say we have 350 pairs of terns nesting on Metinic this year!
We’ve also had chicks of both species start hatching – more than fifty of the island’s most adorable residents have popped out of their shells. The adult terns are already hard at work bringing in enough fish to feed their new chicks. It will be about a month before these little fluffballs are ready to fly, so the adults have their work cut out for them.
These days, Zak and I are out banding chicks in our productivity plots so we can chart their growth. Unlike tern parents, we can’t tell chicks apart without some kind of marker, so all productivity chicks are banded within a day or two of hatching.
We’ve also been trapping and banding adult terns. As with gulls, the best way to trap a tern is on their nest. We replace the eggs with wooden dummy eggs and set a trap that springs when the adult returns to incubate. We then band the tern and take a few measurements before releasing it. The dummy eggs are removed and the real ones are put back in the nest. The terns aren’t too happy with the process, but they always seem to return to the nest within 15 minutes of being released.
By banding adult birds, we have a better chance of seeing the bands again – any breeding adult has already proven its ability to survive at least one migration, so it’s likely that it will survive another year. Some terns can live to be more than thirty years old, and every time we see the band we add another piece of information about that bird’s life.
You may notice us wearing some strange looking hats in our photos. While we’d like to pretend these are the very latest in high fashion, they’re actually a practical method of tern defense. When protecting their nests, adult terns aren’t afraid to peck an invader, be it gull or eagle or human, on the head. They typically aim for the highest part of the body, so adding a flag to the top of you hat is a good way to keep your head from getting pecked.
We’ve got a few more terns stories coming up, plus an update on some of our other seabirds, like Black Guillemots and Leach’s Storm Petrels, so stay tuned!