(179) coming for another supply, but letting me know in advance. She made three trips this time. The call on this occasion was the one which I have termed the "blue-bird call", not that I think it an imitation of it, but that it more nearly resembles that call than any other of which I can think. It is most frequently heard from a bird that is either building a nest and is about to take of eggs material to it, or has a nest and is going to relieve its mate, or has young and is going to take them food. This is not, of course, invariably the case, but it does seem that it is definitely a signal to make its presence known to more or less specific individuals within a limited area, for it is soft and low and cannot be heard far. May 30th. At 8 A.M. I went directly to the nest, the parents were away foraging. The young bird in front squealed (although it is not really a squeal--I can not describe it) then opened its mouth for food, which it took readily enough. They are getting curious about the outside world and while they sleep most of the time, they occasionally stretch their wings and legs and preen. Green-eyes returned first, but his mate entered the nest first, each had a very large spider--some sort of a ground spider, I think. Both birds were eager for the soft the food, eating from the spoon contentedly, giving but little to young ones however. When I left they were both sitting quietly on the rim of the nest, doing nothing, but relaxed and obviously free of care for the time being. The eyes of the young birds are all of the same very dark hue, probably it would be called black. Their bills are but slightly curved. The curve is uniform and there is no sign of a hook as first noted. That notation was in error. Their feathers are growing rapidly. At present they seem to have wing bars of a lighter color than the flight feathers, but this is due to the fact that the shafts of the feathers are bare for a considerable distance and the webs appear only out towards the ends. Their bills are about one third