THE CAVE-DWELLING FAMILY 33 
scrambling about a pile of brush, apparently try- 
ing to make me think that was where he lived. 
But I was sure he had a mate and a nest some- 
where else, and I kept watch for them. 
One day I happened to see a little brown bird 
fly up under the eaves of a summer cottage not 
much bigger than a tent. On looking closely, I 
found that there were openings under the eaves. 
The birds had taken one of these for a door, 
and built a nest inside, in the box frame over a 
window. After that I looked at them through 
another window. Everything went well till the 
wrenlings left the nest and began to fly around. 
Then they seemed to lose their wits, or not to 
mind their parents. They flew wildly about in 
the cottage, bumping against the glass, and seem- 
ing not able to find the door to get out. 
I had not the key to open the big door, so I 
could not help them in their trouble. And the 
old birds were so frantic when I looked in at the 
window, while they were trying to get their 
family out, that I went away and left them. In 
an hour or two I went back, and found every- 
thing quiet, and the wren babies all out on the 
trees. 
