perhaps one of the most striking instances is that of the Sociable
Grosbeak, a bird which is found in the interior of the Cape of Good
Hope. They construct their nests under one roof, which they form of the
branches of some tall and wide-spreading tree, thatching it all over, as
it were, with a species of grass.

"When they have got their habitation fairly covered in they lay out the
inside, according to some travellers, into regular streets, with nests
on both sides, about a couple of inches distant from each other. In one
respect, however, they differ from the beaver, they do not appear to lay
up a common store of food, the nature of the climate not rendering such
a precaution necessary.

"Here is the account of one of these erections furnished by a gentleman
who minutely examined the structure.

"I observed on the way a tree with an enormous nest of those birds, to
which I have given the appellation of republicans; and, as soon as I
arrived at my camp, I despatched a few men, with a waggon, to bring it
to me, that I might open the hive, and examine the structure in its
minutest parts. When it arrived, I cut it in pieces with a hatchet, and
found that the chief portion of the structure consisted of a mass of
Boshman's grass, without any mixture, but so compact and firmly basketed
together as to be impenetrable to the rain. This is the commencement of
the structure; and each bird builds its particular nest under this
canopy. But the nests are formed only beneath the eaves of the canopy,
the upper surface remaining void, without, however, being useless; for,
as it has a projecting rim, and is a little inclined, it serves to let
the rain-water run off, and preserves each little dwelling from the
rain. Figure to yourself a huge irregular sloping roof, and all the