S2 Page 53

Collector: Grinnell - 1925
Location: Mineral
Date: June 28
Page Number: 2507

him, are quantities of castillejas, to which some
peripatetic [female symbol] resorts every now and then. As she
appears, the male launches skyward, to indulge in
from 2 to 5 sky-dives down nearly to the ground
past her. At the lowest portion of this precipitate
parabola, he gives a curious "bzt" sound, like
a bee held down, ^^{just once}. How the sound is made, whether
by wings or syrinx I do not know. Another
[male symbol] Calliope Hummer has his main stand on the tipmost
splinter of the stub in which the Mountain Chickadee's
brood was raised. Another has his stand divided
between the growing tips of 3 closely adjacent young
yellow pines slightly overtopping a sea of snow-brush.
Another perches chiefly on one of the highest twigs of
a service-berry thicket in an opening among firs. In
the case of the Calliope Hummingbird, where "the
house is divided," census designation is not
as clearly determined as in other birds; but
I suppose that the ^^{location of the} nest, alone, should be counted.

4:15 p.m. - Intent. The Mountain Quail's eggs
weighed, in grams, as follows: 11.6, 12.2, 12.3, 13.2,
12.2, 12.0, 12.5, 12.1, 11.4; average of the nine, 12.2 g.
In only two could I detect the slightest trace of
incubation, that is, of blood (which is really rather
advanced, embryonically speaking!).

6270 Cassin Vireo [female symbol] ad. 15.5 g. Shot yesterday, with
set 2/4 (see p. 2500).

Two Red-Tailed Hawks circled near camp today,