Concord, Mass.
1910
May 15
[May 15, 1910]

  Morning clear & warm up to 10 o'clock. Remainder of day cloudy
with frequent light showers of fine rain.

Notes of Yellow bill Cuckoos

  Two Yellow-billed Cuckoos, the first seen here this spring, appeared
in the trees in front of the cabin about 9 A.M. I think they were
a mated pair. One in a leafy maple uttered the long call ending with
tan-tan-tan. The other in an oak but thinly foliaged gave the
single coo and also a peculiar low, wailing cry which I do not 
remember ever hearing before and which in quality (but not in form)
reminded me of the autumnal voice of the Scrub Owl. Both birds
remained nearly motionless on the same perches for eight or ten
minutes uttering their different notes, one answering the other.

Birds singing near Ball's Hill

  A Thrasher sang gloriously all the morning in the 
thickets across the river. Near the cabin we had a Grosbeak,
a Phoebe, two Song Sparrows & a Nashville Warbler. At
evening a Veery in full song & a Whippoorwill across the river.
A Winter Yellow-legs came over the marsh & river at 10 A.M. - whistling.