Many thanks to Bill August for the photos of a heron that he saw at the park October 30th. Birder Janet Crystal notes that Great Blue Heron “don’t migrate like other birds. They are considered a partial migrant because they may move south from their northernmost breeding range as the weather gets colder. They will stay around this area year-round as long as there is open water where they can catch food. It’s not unusual for them to stay around throughout the winter.”
The Riverside Boat Club’s Dick Garver says that rowers often see them standing motionless on the riverbanks. Mary Holbrow added that they are often spotted at the waterfall in Newton/Watertown. Here’s a video of a heron pursuing herring during a recent herring run in the Charles (near the Watertown dam). 2013 was a great year for herring in the Charles.
Mary Holbrow identified the oriole nest above, looking much like a crocheted sack, just on the park side of the pedestrian footbridge. She notes that “According to an informative piece on the National Wildlife Federation website, many birds that use string seem to like white string best. Where the nesting bird found this much of it is a puzzle, though. Possibly from fiberglass scraps and monofilament fishing line.”
After some research, she added: “I looked into bird vision a bit on line. Birds’ visual capabilities are different from ours and differ from one species to another, but in general they have a higher density of red-green-blue color receptors than we do, and also ultraviolet receptors. This makes their vision and contrast perception sharper than ours, so probably your white string shows up brilliantly to them among the greenery. They probably use rather short lengths of string, too; apparently about 6 inches is ideal. Tight knots would be a problem, though; I imagine that last year’s string, if still around, would be easier for them to get off from shriveled leaves and branches.”
Send us your photos of wildlife at the park. This 15-acre stretch along the Charles is our local preserve!