They Are Very Stupid In Making Any Attempt To
Escape; When Angry Or Frightened They Utter The Tucutuco.
Of Those I Kept Alive Several, Even The First Day, Became
Quite Tame, Not Attempting To Bite Or To Run Away; Others
Were A Little Wilder.
The man who caught them asserted that very many are
invariably found blind.
A specimen which I preserved in
spirits was in this state; Mr. Reid considers it to be the
effect of inflammation in the nictitating membrane. When the
animal was alive I placed my finger within half an inch of
its head, and not the slightest notice was taken: it made its
way, however, about the room nearly as well as the others.
Considering the strictly subterranean habits of the tucutuco,
the blindness, though so common, cannot be a very serious
evil; yet it appears strange that any animal should possess
an organ frequently subject to be injured. Lamarck would
have been delighted with this fact, had he known it, when
speculating [7] (probably with more truth than usual with him)
on the gradually _acquired_ blindness of the Asphalax, a
Gnawer living under ground, and of the Proteus, a reptile
living in dark caverns filled with water; in both of which
animals the eye is in an almost rudimentary state, and is
covered by a tendinous membrane and skin. In the common
mole the eye is extraordinarily small but perfect, though
many anatomists doubt whether it is connected with the true
optic nerve; its vision must certainly be imperfect, though
probably useful to the animal when it leaves its burrow.
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