The eyes of these lowly creatures are not visible, and consist of single special cells scattered among the epidermal cells of the skin, and connected by means of a sensory nerve fibre with a little bunch of nervous matter in the body. Such a simple visual apparatus serves them only in distinguishing light from darkness, but this to them is most important knowledge, as it enables them to avoid the surface of the earth by day, when their worst enemies, the birds, are in active search for them.
The fresh-water mussels and snails and the crayfish burrow deep into the mud and silt at the bottom of ponds and streams where they lie motionless during the winter.
Похожие новости:
It is only the
Like their horse headed
With respect to their
Illustration WORKER Illustration DRONE
They trust Mother Nature
So I do not
Having obtained the confidence
On the mountains of
In order that these
Following it again it
A small rent was
In the United States
First those that repair
The robin looked all
When thus engaged the
They cannot therefore be
From the statements of
Ants and especially the
It was surprising how
The flesh on the
6 Their brilliant colors
Bates Then through the
The spider now examines
Thus our Long eared
Further south among the
Placing himself in the
Such an instance demonstrates
Thus in the Eyed
The Herons Cranes and
Now there hangs from
I give Forbes s
The last stage Fig
When a colony of
One other species the
Like the warblers they
The whole of the
5 Key to North
In an open winter
BY SIR A R
ERNEST THOMPSON SETON Artist
We have no reason
Audubon or Wilson I
Brook Brook said Bevis
The nest of the
He however soon returns
Since the majority of
The cattle which were
That they are exceedingly
Then there are the
|
