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This research is done on the series of books written by John Norman, the comments in italics are mine and my point of view.
Woman of Gor
It is at night that the sleen hunts, that six-legged, long-bodied mammalian carnivore, almost
as much a snake as an animal. I had never seen one, but had seen the tracks of one seven
years before.

I caught a strange, unpleasant scent, much like a common weasel or ferret, only stronger. In
that instant every sense was alert.

I froze, an almost animal response.

I was silent, seeking the shelter of stillness and immobility. My head turned imperceptibly as I
scanned the rocks and bushes about the road. I thought I heard a slight sniffling, a grunt, a
small doglike whine. Then nothing.

It too had frozen, probably sensing my presence. Most likely it was a sleen; hopefully a young
one. I guessed it had not been hunting me or I would not have been likely to have smelled it.
Perhaps I stood thus for six or seven minutes. Then I saw it, on its six short legs, undulate
across the road, like a furred lizard, its pointed, whiskered snout swaying from side to side
testing the wind. Outlaw of Gor, page 34
Where there are rarely sleens

Conspicuously absent in the rain forests of the Ua were sleen. This is just as well for the sleen,
commonly, hunts on the first scent it takes upon emerging from its burrow after dark. Moreover
it hunts single-mindedly and tenaciously. It can be extremely dangerous to men, even more so,
I think, than the Voltai, or northern, larl. I think the sleen, which is widespread on Gor, is not
found, or not frequently found, in the jungles because of the enormous rains, and the
incredible dampness and humidity. Perhaps the sleen, a burrowing, furred animal, finds itself
uncomfortable in such a habitat. Explorers of Gor, page 312