Concord, Mass.
1910.
May 27
[May 27, 1910]

  Early morning clear with cool N. [north] winds. Afternoon cloudy & warm.
Light thunder shower about noon & heavy one at 5 P.M.

Arrivals
North-bound migrants

  Arrived. Wood Thrush 1 singing at morning & evening in Barrett Run.
  Wood Pewee 1 [singing] near stone boat house opp. [opposite] Ball's Hill, 8 A.M.
  Wood Pewee 1 [singing] at Farm behind barn at 7 P.M.
  North-bound migrants (previously noted) were Black-poll Warbler 2 [in full song]
  Usnea Warbler 1 [in full song], Wilson's Black-cap, 1 [in full song], Water Thrush 1 [in full song]

Maryland Yellow-throat with odd song.

  A Maryland Yellow-throat at Ball's Hill regularly began
his song (otherwise normal) by a peet-weet so very like that
of the Spotted Sandpiper that I though [thought] for some time that
there was a Sandpiper calling whenever the Yellow-throat sang.

Orioles eating larvae of brown tail moth in sprayed oak

  None of the Orioles settled at the Farm seem to have
suffered any injury as yet from the spraying. Gilbert saw
a pair at the nest over our dooryard this forenoon. At
sunset I saw all three males within a foot or two of
one another in the top of a large white oak that has been
half-stripped of its foliage by brown tails. They were feeding
on large hairy caterpillars which looked like brown tails.
I saw them pick them off the leaves and then shake &
batter them against the twigs just before eating them.
One bird devoured three of these caterpillars while I 
was watching him. The oak stands near the roadside just 
behind our house. I saw the town power sprayer
deluge it with poisoned water yesterday but none of this
quite reached the topmost twigs where the Orioles were
at work this evening.