v 
The moment he showed himself in the open, he was 
discovered by a Grow whose excited cawing brought others of 
his kind from every direction until within the next few 
minutes a dozen or more assembled and mobbed the Owl after 
their usual fashion, 
I wonder why the Crows do not mob the young Owls. 
They must certainly be aware of their presence. The rabbit 
skin still lay by their side but it looked much smaller than 
it did yesterday and I think they have devoured part of it. 
[I Black-throated Green Warbler was singing on Ball’s 
Hill this morning and I heard one or more Chimney Swifts 
twittering there late this afternoon. Faxon reports the 
arrival of the Least Flycatcher and Towhee at Arlington on 
April 30th. 
After tea this evening Faxon and I took a long walk 
through the fields in the direction of Concord. We heard 
a Bittern but no Snipe. A tremendous din of Hyla voices last 
evening and to-night. It fairly made own’s ears ache to 
approach the edges of the ponds and river meadows,3 
