Saturday, April 3, 2010

Cold, blustery spring morning in the Bitterroot Valley. Observed group of tree swallows perching in Siberian elm catching morning sun rays, video follows.

There are about 81 species of swallows/martins worldwide in the Hirundinidae family; on all continents except the Arctic and Antarctic regions. All North American species are primarily insect eaters, excepting the tree swallow which eats a quantity of vegetable matter...wax myrtle berries being a favorite. A study done by F.E.L. Beal in 1918 discovered that Diptera (flies) comprise ~40% of animal food taken.