1908
April 6
Concord, Mass.
  Brilliantly clear with fresh W. wind. Deliciously warm at noon.
Altogether a perfect early spring day.
  At Ball's Hill where I spent the entire day there were
very many more birds than I have seen at the farm of late.
Two male Phoebees were in full song at once near the cabin
& at least one of them had a mate. A Pine Warbler sang
half a dozen times or more on the crest of the hill about
10 A.M. and a Robin with a really good voice was singing
there at 5 P.M. Fox Sparrows literally swarmed in the 
brush along the river path. I started fully fifty in
one place. Their wings made as much noise as those of a 
full bevy of Quails as they flew up from the ground into
the trees. There were others scattered everywhere along this
path. I heard only one sing. At the farm we had no 
more than seven or eight this morning.
Pine Warbler arrives
Unusual numbers of Fox Sparrows
  A pair of Red-shouldered Hawks were soaring and
screaming over the hill in the forenoon and in the late
afternoon. I saw a fine male Marsh Hawk beating the
flooded thickets across the river. Twice during the day 
a pair of Black Ducks flew about over the meadows
& over Ball's Hill. Red wings were singing everywhere
at five o'clock. A little later I saw a flock of 25
males followed by another flock of 17 flying over the
fields towards the N.E. as is their habit at this hour & season.
Red-shouldered Hawks
Red wings
  At rather frequent intervals through the day we heard
the cuckoo-like calls of two Pied-billed Grebes. First one
would call & almost immediately the other would answer.
Both birds were in the flooded thickets opposite Bensen's landing.
Pied bill Grebes
  Leopard Frogs in full cry at noon, Hylas & Wood Frogs in P.M.
Hepaticas & Spring Beauty in flower in front of cabin.
Leopard Frogs
Hepaticas & Spring Beauty