GREEN, GREENISH GRAY, AND OLIVE 449 
Nest : Made of dry leaves, cocoons, and spider webs ; lined with grass and 
bark ; hung in thickets, bushes, oaks, and alders. 
Eggs: 3 or 4; white, sparsely speckled with burnt umber. Size 0.80 X 
0.58. 
Tue Cassin Vireo is more common along the Sierra 
Nevada than through the valleys, and is most abundant 
in the coniferous forests half-way up the mountains. 
Here its characteristic song, “ Mary, Mary, Mary / look 
up here!” bears so close a resemblance to that of the 
yellow-throated vireo of the Eastern States as to make 
it seem like the same bird. 
His beautiful basket nest will be swung from the 
branches of an oak or spruce, and, so long as the little 
green mother is brooding, his happy warble will ring 
from the nest tree begging her in tenderest tones to 
“look up here!’ At Shppery Ford on the Lake 
Tahoe road, one of these little singers followed me from 
tree to tree, whenever I was within fifty feet of his nest, 
singing from the lowest twigs a foot or two above my 
head and peering down at me curiously as he repeated 
his quaint invitation. His nest was only six feet from 
the ground and, June 3, contained four eggs. Sitting 
began that day, and two days later both nest and con- 
tents had disappeared and, with them, the happy singer 
and his mate, probably into a collecting basket. I 
searched for them day after day, but found no trace of 
them in the neighborhood. Another pair of the same 
species were finishing their nest in a tree not far from 
the hotel, and it, like the first, was decorated with white 
cocoons until it looked almost like a hornet’s nest among 
the green leaves. These birds, although building nearer 
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