The Naturalist in La PlataHudson, W. H. (William Henry)
History
The Naturalist in La Plata
Hudson, W. H. (William Henry)
Animal behavior -- Argentina -- Pampas; Natural history -- Argentina -- Pampas; Zoology -- Argentina -- Pampas
Looking like one insect, they spin rapidly round for a few moments, then
up springs the wasp--victorious. The wretched victim is not dead; its
legs move a little, but its soft body is paralyzed, and lies collapsed,
flabby, and powerless as a stranded jellyfish. And this is the
invariable result of every such conflict. In other classes of beings,
even the weakest hunted thing occasionally succeeds in inflicting pain
on its persecutor, and the small trembling mouse, unable to save itself,
can sometimes make the cat shriek with paiu; but there is no weak spot
in the wasp's armour, no fatal error of judgment, not even an accident,
ever to save the wretched victim from its fate. And now comes the most
iniquitous part of the proceeding. When the wasp has sufficiently rested
after the struggle, it deliberately drags the disabled spider back into
its own hole, and, having packed it away at the extremity, lays an egg
alongside of it, then, coming out again, gathers dust and rubbish with
which it fills up and obliterates the hole; and, having thus concluded
its Machiavellian task, it flies cheerfully off in quest of another
victim.
The extensive Epeira family supply the mason-wasps and other
spider-killers with the majority of their victims. These spiders have
soft, plump, succulent bodies like pats of butter; they inhabit trees
and bushes chiefly, where their geometric webs-betray their whereabouts;
they are timid, comparatively innocuous, and reluctant to quit the
shelter of their green bower, made of a rolled-up leaf; so that there
are many reasons why they should be persecuted. They exhibit a great
variety of curious forms; many are also very richly coloured; but even
their brightest hues--orange, silver, scarlet--have not been given
without regard to the colouring of their surroundings. Green-leafed
bushes arc frequented by vividly green Epeiras, but the imitative
resemblance does not quite end here. The green spider's method of
escape, when the bush is roughly shaken, is to drop itself down on the
earth, where it lies simulating death. In falling, it drops just as a
green leaf would drop, that is, not quite so rapidly as a round, solid
body like a beetle or spider. Now in the bushes there is another Epeira,
in size and form like the last, but differing in colour; for instead of
a vivid green, it is of a faded yellowish white--the exact hue of a
dead, dried-up leaf. This spider, when it lets itself drop--for it has
the same protective habit as the other--falls not so rapidly as a green
freshly broken off leaf or as the green spider would fall, but with a
slower motion, precisely like a leaf withered up till it has become
almost light as a feather. It is not difficult to imagine how this comes
about: either a thicker line, or a greater stiffness or tenacity of the
viscid fluid composing the web and attached to the point the spider
drops from, causes one to fall slower than the other. But how many
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