Sangeetha Pulapaka
2

When I think of sparrows an incident comes to my mind. There was the house sparrow, who used to come into my kitchen to eat the tiny bits of food that fell on the kitchen slab! The amazing thing I noticed is the little thing used to eat only the food which was on the kitchen slab and not on the floor! And one more suprising thing is he/she also arrived sharply at 1.30 in the afternoon, knowing that this was the time food would be available! I wouldn't have noticed if not for the high pitched sound he/she used to make before entering the kitchen. To test it, I used to keep a small amount of the food outside on the balcony, it used to come from. But no, it never used to touch it! I wonder why.

Coming back to your question.

Geese and some other species of birds migrate in distinctive ‘V’ or ‘U’ formations or in lines. This is because by taking advantage of the wing tip vortex of the bird in front, each bird can save energy by reducing drag. The energy savings in flight can be as much as fifty percent. When a goose falls out of formation, it suddenly feels the drag and resistance of flying alone. It quickly moves back into formation to take advantage of the lifting power of the bird in front of it. The V formation reduces wind resistance and keep the flock together.

When the lead goose tires, it rotates back into the formation and another goose flies to the point position. Contrary to popular opinion, the lead bird of the V formation is not always an adult male; rather, the geese shift their relative positions frequently during the flight.

 In the temperate zone of North America, many smaller birds form mixed-species flocks in winter. There are two theories about why birds do this: to improve foraging or to reduce the risk of predation. These benefits are not mutually exclusive, and research suggests that in many cases both benefits are present. The benefits fall mostly to “follower” species, however, and it’s less clear why “leader” species put up with the followers. It’s possible that the leaders don’t lose much by having the followers, maybe gain a little, and would expend too much energy trying to lose their followers. So they mostly ignore them. A house sparrow lives more of a sedentary lifestyle and travel only for a few kilometeres.