Life histories of North American shore birds, Part 1 (of 2)Bent, Arthur Cleveland
Science
Life histories of North American shore birds, Part 1 (of 2)
Bent, Arthur Cleveland
Birds -- Behavior; Shore birds -- North America
The normal set of eggs consists of four. A greater number has never
been found, and a less number only when it was uncertain if the
full set had been laid. As much as three days may intervene between
egg laying, but usually the four are deposited on successive days.
When one set of eggs is taken, another will be laid. But the same
nest is not used the second time, the contentions of some natives
to the contrary notwithstanding. A set of eggs found as late as
July 24, 1917, certainly indicated that two may be laid in the same
season on rare occasions. One set is the rule.
The color of the eggs is, as would be expected, somewhat variable.
The lightest set examined in connection with this report has the
ground color "greenish glaucous." From this there is perfect
gradation through "court gray" and "light olive gray" to "deep
olive buff" in the darkest set. Variation in any particular set is
very slight. Spots are large and bold as a rule. They vary in size
from 15 millimeters to less than one, and they are usually massed
about the larger end. In one case the eggs are uniformly spotted
with small spots all over. In none is the spotting heaviest on the
smaller end (reversed eggs). Spots are usually inclined to be
round, but occasionally they are in the form of streaks arranged
roughly in spiral form. Only rarely are they banded about the
larger end. In two cases a narrow black line was produced spirally
on the larger end. The coloration of the spots varies from "snuff
brown" to "sepia" and from "cinnamon brown" to "mummy brown." In
some cases they are "raw umber." The darkest shades occur where
the spots overlap and some deep-seated ones are "pale aniline
lilac" or "pale" to "deep quaker drab." Only rarely is the outline
of a spot not sharp.
The average dimensions derived from the above series of 72 eggs
are: Length, 39.473 and breadth 27.468. Those which showed the
extreme measurements were =42.0= by 27.8; =35= by 27.4; 37.6 by
=39=, and 39.1 by =26.4.=
_Young._--The period of incubation is said to be about 20 days, in which
both sexes share. William Palmer (1899) says:
Public-domain text, read in full here on John Shaqi.
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