The Wonder Book of Knowledge: The Marvels of Modern Industry and Invention, the Interesting Stories of Common Things, the Mysterious Processes of Nature Simply Explained
History
The Wonder Book of Knowledge: The Marvels of Modern Industry and Invention, the Interesting Stories of Common Things, the Mysterious Processes of Nature Simply Explained
Industrial arts -- History
Tortoises lay their eggs in underground nests, where they remain for
almost a year, and, strange to say, they have a very curious way of
drilling holes for these nests with their tails. A tortoise picks a spot
where the earth is bare, and then stiffens its tail by contracting the
muscles strongly, placing the tip firmly against the ground and boring a
hole by moving it round and round in a circle, until a cone-shaped
cavity is produced, wide at the top but tapering to a point below. When
this operation is completed, it immediately sets to work to enlarge the
hole with the help of its hind legs. It does this by scooping out
“shovelfuls” of dirt, first with one of its hind feet and then with the
other, and heaping it up like the wall of a fortress around the pit.
Tortoises use their feet like hands when they do this, very carefully
placing the dirt in a circle at some little distance from the edge of
the cavity, and the work is continued until the hole is dug down as deep
as the hind legs will reach. When it finds that no more soil can be
removed, that is, at the end of an hour or more of steady digging, the
tortoise accepts the job as completed and proceeds to deposit its eggs
inside very carefully, just as you would put hen’s eggs into a basket.
While all this is going on the body is scarcely moved and the head is
kept inside the shell.
There are usually nine eggs and they just about fill the bottom of the
nest, which measures approximately five inches across and is itself
shaped more or less like an egg, being wider inside than at the top.
After about half an hour’s rest, the hardest part of the work is
begun--that of filling up the hole and leveling the ground. The dirt is
placed carefully over the eggs, a “handful” at a time, the hind legs
being used alternately again for that purpose. As the cavity is
gradually filled up the tortoise presses the earth down with the outer
edge of its foot. It takes another half hour’s rest after all the dirt
has been carried back again, and then commences the part of the
operation where the tortoise moves quickly enough to merit another
racing title. It beats down the dirt-mound and stamps it firm and flat
with the under side of its hard shell, raising the hind end of its body
and then hurriedly letting it drop to the ground again, turning round
and round in a circle very briskly in the meantime, at the same time
doing all it can to remove any traces which might lead to the discovery
of its nest.
The Story in a Newspaper[11]
Public-domain text, read in full here on John Shaqi.
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