PLATE 4 
EXPLANATION OF F4GURES 
12 Female cuckoo cleaning nest, sac in bill. Nest no. 1. -5- natural size. 
13 Female cuckoo feeding hairy caterpillar to young; "mouth-reaction." 
Insect held in mouth simply, from one-half minute to five minutes, before swallow- 
ing reflex ensues. About 1 natural size. 
14 Female feeding young. First movement in "throat-reaction". Hereagrass- 
hopper is inserted in the mouth. Nest no. 3, July 26, a. m., after bird no. 1 has 
climbed out. About 1 natural size. 
15 Female serving gray moth, " throat-reaction," final position before swallow- 
ing reflex comes. Nest no. 3, July 25, 5.51 p. m. Remaining egg which was addled, 
is now completely neglected, and was found on the ground the day following. 
