No. 194 Putorius Moupinensis
Habitat.—Thibet.
Description.—Reddish-brown, white under the chin, and then again a patch on the chest.
Lutridæ — The Otters
We now come to the third group of the musteline animals, the most aquatic of all the Fissipedia—the Lutridæ or Otters—of which there are two great divisions, the common Otters (Lutra) and the Sea-Otters, (Enhydra). With the latter, a most interesting animal in all its ways, as well as most valuable on account of its fur, we have nothing to do. I am not aware that it is found in the tropics, but is a denizen of the North Pacific. Of Lutra we have several species in two genera. Dr. Gray has divided the Otters into no less than nine genera on three characteristics, the tail, feet, and muzzle, but these have been held open to objection. The classification most to be depended upon is the division of the tribe into long-clawed Otters (Lutra), and short or rudimentary-clawed Otters (Aonyx). The characteristics of the skulls confirm this arrangement, as the short-clawed Otters are distinguishable from the others by a shorter and more globose cranium and larger molars, and, as Dr. Anderson says, “the inner portion of the last molar being the largest part of the tooth, while in Lutra the outer exceeds the inner half; the almost general absence of the first upper premolar; and the rudimentary claws, which are associated with much more feebly-developed finger and toe bones, which are much tapered to a point, while in Lutra these bones are strong and well developed.” Gray has separated a genus, which he called Pteronura, on account of a flattened tail arising from a longitudinal ridge on each side, but this flattening of the tail is common to all the genera more or less.
Otter’s skull (side and under view).
All the Otters, though active on land, are still only thoroughly at home in the water, and they are therefore specially constituted for such a mode of life. They have an elongated flattened form; webbed feet with short claws; compressed and tapering tail; dense fur of two kinds, one of long brown shining hairs; the under fur short and fine, impervious to wet, and well adapted for keeping an equality of temperature; the skull is peculiar, the brain case being very long, and compressed from above downwards; the facial portion forms only about one-fourth of the extreme length; the teeth are strong and sharp; the upper flesh tooth very large.
Dental formula: Inc., 3—3/3—3; can., 1—1/1—1; premolars, 4—4/3—3; molars, 1—1/2—2.
Jerdon states that the otter has a nictitating membrane or additional semi-transparent eyelid, similar to that in the eyes of birds, which he supposes is a defence to them under water; but I have not noticed this myself, and have failed to discover it in the writings of others. I should think that the vision of the animal under water would not require obscuring by a semi-transparent membrane, which none of the marine carnivora possess, though their eyes are somewhat formed for seeing better under water than when exposed to the full light above. Some idea of the rapidity of these animals in the water may be conceived when we think that their food is almost exclusively fish, of which they sometimes kill more than they can eat. They reside in burrows, making the entrance under water, and working upwards, making a small hole for the ventilation of their chamber. The female has about four or five young ones at a time, after a period of gestation of about nine weeks, and the mother very soon drives them forth to shift for themselves in the water.
For a pretty picture of young otters at play in the water, nothing could be better than the following description from Kingsley’s ‘Water Babies’:—
“Suddenly Tom heard the strangest noise up the stream—cooing, grunting, and whining, and squeaking, as if you had put into a bag two stock-doves, nine mice, three guinea-pigs, and a blind puppy, and left them there to settle themselves and make music. He looked up the water, and there he saw a sight as strange as the noise: a great ball rolling over and over down the stream, seeming one moment of soft brown fur; and the next of shining glass, and yet it was not a ball, for sometimes it broke up and streamed away in pieces, and then it joined again; and all the while the noise came out of it louder and louder. Tom asked the dragon-fly, what it could be: but of course with his short sight he could not even see it, though it was not ten yards away. So he took the neatest little header into the water, and started off to see for himself; and when he came near, the ball turned out to be four or five beautiful creatures, many times larger than Tom, who were swimming about, and rolling, and diving, and twisting, and wrestling, and cuddling, and kissing, and biting, and scratching, in the most charming fashion that ever was seen. And if you don’t believe me you may go to the Zoological Gardens (for I am afraid you won’t see it nearer, unless, perhaps, you get up at five in the morning, and go down to Cordery’s Moor, and watch by the great withy pollard which hangs over the back-water, where the otters breed sometimes), and then say if otters at play in the water are not the merriest, lithest, gracefullest creatures you ever saw.”
Professor Parker, who also notices Kingsley’s description,[9] states that the Canadian otter has a peculiar habit in winter of sliding down ridges of snow, apparently for amusement. It, with its companions, scrambles up a high ridge, and then, lying down flat, glides head-foremost down the declivity, sometimes for a distance of twenty yards. “This sport they continue apparently with the keenest enjoyment, until fatigue or hunger induces them to desist.”
9 In fact it was his quotation that induced me to buy a copy of that most charming little book, which I recommend every one to read.—R. A. S.
The following are the Indian species; Lutra nair, L. simung vel monticola, L. Ellioti, and L. aurobrunnea of the long-clawed family, and Aonyx leptonyx of the short-clawed.
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