Movement at Last
It was a Discovery Channel program on the great African migrations I believe where I learned that the herds of animals begin to get restless prior to movement. A tension builds and the individual members seem unable to enjoy the grass or their neighbors or even the shrinking waterholes. And at some point a critical mass is arrived at and they set off. I noticed this with Purple Martins on a very unscientific level. My father and mother loved Purple Martins, and Dad, a master carpenter, built several martin apartment houses. The birds arrived to occupy them on Mother's birthday, March 29th. You could almost calibrate your calendar by them. Then about now every year the parents of that year's fledglings took to the trees and abandoned the constant feeding of their young until they got hungry enough to follow them to the trees. For two weeks the trees seemed alive with the frenzy of the Purple Martins coming and going from their flights to catch mosquitoes and other bugs over...