They left us again- just like every year since putting up their bird houses. Migrated, I suspect, is the better term. From April to late July these sleek birds grace us and amaze us by their aerial acrobatics, fierce protection of their nests, feeding and swarming behaviors. Purple Martins are impressive birds and beautiful in so many ways.
Purple Martins are 7.5 to 9 inches long and weigh about two ounces. They are swallows and in size between a sparrow and an American Robin. They have a slightly hooked bill, short split tail, and long, tapered wings. These broad chested birds are built for speed and for flying long distances as indeed they regularly do.
Each year Purple Martins leave their nesting areas in the eastern half of the United States and migrate thousands of miles to winter in the rain forests of Brazil and the Yucatan. Geolocators on Purple Martins have shown the Fall migration can be drawn out, but the Spring migration back to the United States is much more direct, presumably so that the Purple Martins can arrive first to find the best mates and nesting sites.
The birds will also return to earlier nesting sites if they previously have found them suitable. Knowing this gives Trudy and me pleasure, believing we have returning friends to our ranch in central Texas who enjoyed their earlier stays and our accommodations.
Below are several pictures of our Purple Martin houses and swarming Purple Martins.
The Purple Martins swoop through the air with beaks open, catching winged insects mid-air. No wonder we have so few mosquitoes. Their mobility, gliding, and speed are truly impressive to witness. Here in the picture they are returning to their nests to feed their young.
After returning to the bird houses in our backyard each Spring, they spend time building their nests. Hatching of the eggs takes around 26 days. The swooping birds are especially active first thing in the morning and just before and during sunset.
The birds live in colonies that provide protection from predators. Their main predators are hawks and owls and indeed we once had our Purple Martin house and its avian contents savaged by an unknown predator. We have since seen a hawk swoop close by the Purple Martin houses and witnessed two brave Purple Martins, like angry fighters, chase away the much larger hawk. The Martins did this by weaving and diving at the hawk, their exceptional mobility and speed making this effective strategy rather than suicidal behavior.
Toward the end of their stay, we notice increasing numbers of birds flying about (staging). This swarming or staging as it is known by birders is preparatory for their long migration to Brazil. And then all of a sudden, they are gone. Vanished. What had been bird houses teeming with birds and hordes of birds in the air are suddenly vacant houses and empty sky.
Trudy and I miss these amazing and social creatures. We have now but to clean and repair their houses and ready them again for the Spring return of yet another troop of colonizing Purple Martins. Safe Travels! See you next year.