Friday, January 14, 2011

Two Red-tailed Hawks and a Bald Eagle

Last week I was watching a pair of local nesting and wintering Red-tailed Hawks. The pair nested in a large white pine nearby last year, successfully raising one chick. During the summer, after their young had fledged, they built at least two additional nests, one of which at least was done with the active assistance of their recently fledged bird.

The pair has apparently remained near their nesting territory during the fall and winter and, over at least the past two months at least, the male has broken off branches (see photo above) and carried them to multiple nests, where he alone appears to place and work the branches into the nest. (Not very assiduously, however. Not much time is spent working the stick around the nest, and I have not seen the female land in the nest to rework the sticks at all during non-breeding season.) Their attention to their nesting territories is merited because I have seen at least 5 other Redtails in the immediate vicinity, including four birds that appear to be western-type Red-tailed Hawks, likely winterers from eastern Canada (they are much darker overall, with dark throats, heavy rufous bibs, much heavier belly bands, and much darker backs.)

I was particularly intrigued last Tuesday when I was observing the local male (and vice versa; he clearly recognizes and tolerates me). Suddenly he took off, flying low over me and small but dense woods in the direction of a nearby dam. I just figured he was gone hunting. Within seconds, however, I had a subadult Bald Eagle fly right over me at treetop level, followed by the male adult Red-tailed Hawk, flying low right behind the eagle like a school principal ready to crack down on the intruder if it did anything wrong. It was acting like a Red-winged Blackbird that attacks a passing Red-tailed Hawk in spring, except this time the hawk did not make direct contact with the eagle. On a highway, however, the hawk would have been arrested for tailgating.

As the birds got about 30 yards down from me, the male veered off from direct pursuit and turned to kite into the wind over the primary nest tree while his somewhat larger mate shot out of the woods and replaced him on the eagle’s butt. The female adult Redtail escorted the subadult eagle out of sight, but reappeared quickly over the trees and soared up to an altitude somewhat higher than her mate, where she kited into the wind high above her territory and her mate. The two birds “hung” there for what seemed several minutes. The eagle did not reappear.

This reminded me of last March, when the last migrant Bald Eagle that I saw locally that season, flew up along the east side of the lake, just above the treetops. As the eagle passed, Red-tailed Hawk after Red-tailed Hawk came out of the woods along the lake edge and hung in the sky, kiting into the wind, clearly making their claim to the territory beneath and warning the eagle to keep moving. It reminded me of the “dirigible wall” used in Europe in the first half of the twentieth century to warn of and discourage approaching enemy aircraft. It was almost comical. This time, however, I was impressed to see the Red-tailed Hawks’ aggressiveness in protection of their nesting territory early in January! Watching this pair of suburban Red-tailed Hawks year-round is fascinating.

1 comment:

  1. thats nice i wonder if that eagle learned his lesson