I have also seen gaucho boys catch the Silver-bill (Lichenops
perspicillata) by hurling a stick or stone at the bird, then rushing at
it, when it sits perfectly still, disabled by fear, and allows itself to
be taken. I myself once succeeded in taking a small bird of another
species in the same way.

Amongst mammals our common fox (Canis azarae), and one of the opossums
(Didelphys azarae), are strangely subject to the death-simulating swoon.
For it does indeed seem strange that animals so powerful, fierce, and
able to inflict such terrible injury with their teeth should also
possess this safeguard, apparently more suited to weak inactive
creatures that cannot resist or escape from an enemy and to animals very
low down in the scale of being. When a fox is caught in a trap or run
down by dogs he fights savagely at first, but by-and-by relaxes his
efforts, drops on the ground, and apparently yields up the ghost. The
deception is so well carried out, that dogs are constantly taken in by
it, and no one, not previously acquainted with this clever trickery of
nature, but would at once pronounce the creature dead, and worthy of
some praise for having perished in so brave a spirit. Now, when in this
condition of feigning death, I am quite sure that the animal does not
altogether lose consciousness. It is exceedingly difficult to discover
any evidence of life in the opossum; but when one withdraws a little way
from the feigning fox, and watches him very attentively, a slight
opening of the eye may be detected; and, finally, when left to himself,
he does not recover and start up like an animal that has been stunned,
but slowly and cautiously raises his head first, and only gets up when
his foes are at a safe distance. Yet I have seen gauchos, who are very
cruel to animals, practise the most barbarous experiments on a captive
fox without being able to rouse it into exhibiting any sign of life.