Concord, Mass.
1912.
April 16
[April 16, 1912]

  Sunny and oppressively warm with fresh southerly winds.
Procession of heavy thunder showers 5-9 P.M.

Great Blue Herons migrating at immense height.

  At 2 P.M. I saw two Great Blue Herons flying over
the farm towards the north-east at an elevation of
fully a mile, one following closely in the wake of the other.
For the most part they flapped their wings steadily
and ceaselessly but twice I saw one of them sail for
the distance of a few rods on set wings. I cannot remember
ever before seeing Herons of any kind flying at so great a height.

Canada Geese migrating at great height.

  As I was passing through Birch Field at 4.20 P.M. I
heard the distant honk of a Goose given twice. A moment
later a flock of 36 Canada Geese appeared so very high
in air that they looked no larger than Bluebirds. Heading
due north over Green Field they were soon out of sight
nor did I again hear them call. They were flying in the
usual V formation. They must have been at least a mile above the
earth. Rarely have I witnessed anything of the kind so impressive.