Cliff Swallow Mayhew 1950 April 27 Poleline Bridge, 3 mi. N.E. of Davis, Yolo Co., Calif. At 11 AM. one bird fed another in nest 2-4. At 11:02 A.M. one bird returned to nest 2-17 where another bird had its head out the door. The returning bird entered the nest & I could see one of the birds in the act of eating something, but was unable to tell which one it was. In about 5 seconds one of these birds left the nest & the other sat with its head out the door. At 11:08, the other bird returned to the nest, climbed inside & this time I saw both of them eating something. As soon as the food was down, one of them stuck its head out the door again. In a moment it was out of the nest. At 1-1, a bird had its head out the door. Another bird landed at the opening, for some reason the bird inside became antagonistic. It grabbed the wing of the other bird in its beak & pushed it off the opening, so that the bird outside was hanging in mid-air by its wing in the other bird's bill. It kicked its feet in the air, but I no avail. After about 5 seconds the bird inside let go, allowing the other bird to fly off. There is almost no activity in section 3 where the great majority of last year's nests remain. From here I can see no heads sticking out of any of the 22 nests that can be seen from here. When hanging at the opening & the