Concord, Mass.
1909.
April 1
  Still another day of absolutely cloudless skies,
crystal clear air and rushing N.W. wind. A little colder
than yesterday. Temp. fell to 29 degrees last night & rose to 50 degrees today.
Weather
  Noted for first time this spring ___ Cooper's Hawk male and female in a flock
   I doubt if any small birds arrived from the South
or left for the North, last night. I saw rather fewer than
yesterday but then I covered less ground to-day. The make
up of the mixed flock of Sparrows at our seed bed at rear
of house remained about the same there being to-day 18
Fox Sparrows, 6 or 8 Juncos and 3 Song Sparrows. The Fox
Sparrows were singing gloriously at sunrise and freely through
most of the day. I have never known them continue feeding
so late into the evening before. There were 14 on the seed bed
when we sat down to dinner at 6.10. They did not disperse
until about 6.30 or nearly half an hour after sunset.
Migration notes
   I saw the pair of Cooper's Hawks about 9 A.M.
flying together over Pulpit Rock woods, alternately gliding
and soaring. After a minute or two the female left her
mate and came up over the orchard breasting the strong
wind and passing me within a long shot gun range. She
called thrice uttering each time a throaty, guttural single
note which sounded like huck.
Coopers Hawks arrive
  The Wood Frogs were croaking in the pool below
the orchard from noon to 3 P.M. to-day. Edward Emerson
heard them yesterday (for the first time) in three
different places including Walden woods & the Assabet.
He heard Hylas two days earlier than this he tells me.
Wood Frogs
Hylas