Lions commonly live in a den of their own making. This is sometimes dug in loose sand or soil where its entrance is concealed among bushes. Sometimes it is beneath a fallen log or a tree root, and in other places a semi-den, beneath rocks, is enlarged. In this den the young are born, and the old ones may use it a part of each year, and for year after year. Though occasionally a mother lion may raise as many as five kittens, rarely does she succeed in raising more than two; and I think only two are commonly brought forth at a birth. These kittens probably remain with the mother for nearly a year, and in exceptional cases even longer. As I have seen either kittens or their tracks at every season of the year, I assume the young may be born at any time. The mountain lion is a big-whiskered cat and has many of the traits possessed by the average cat. He weighs about one hundred and fifty pounds and is from seven to eight feet long, including a three-foot tail. He is thin and flat-sided and tawny in colour. He varies from brownish red to grayish brown. He has sharp, strong claws. Mr. Roosevelt once offered one thousand dollars for a mountain lion skin that would measure ten feet from tip to tip. The money was never claimed. Apparently, however, in the state of Washington a hunter did succeed in capturing an old lion that weighed nearly two hundred pounds and measured ten and a half feet from tip to tip. But most lions approximate only one hundred pounds and measure possibly eight feet from tip to tip. The lion eats almost anything. I have seen him catching mice and grasshoppers. On one occasion I was lying behind a clump of willows upon a beaver dam. Across the pond was an open grassy space. Out into this presently walked a mountain lion. For at least half an hour he amused or satisfied himself by chasing, capturing, and eating grasshoppers. He then laid down for a few minutes in the sunshine; but presently he scented something alarming and vanished into the thick pine woods. One evening I sat watching a number of deer feeding on a terrace of a steep mountain side. Suddenly a lion leaped out, landing on the neck of one. Evidently the deer was off balance and on a steep slope. The impact of the lion knocked him over, but like a flash he was upon his feet again. Top-heavy with the lion, he slid several yards down a steep place and fell over a precipice. The lion was carried with him. I found both dead on the rocks below.