Nature Notes From Crater Lake - Volume 21, 1955
Crater Lake Institute online library - www.craterlakeinstitute.com
We returned to Lost Creek on the 15th day of June, 1955. Almost immediately we found that a pair of yellow-bellied marmots, Marmota f. flaviventris (Audubon and Bachman), had made their home under the old barn. During the summer we watched their comings and goings with a great deal of interest.
On July 9th, I happened to walk by the barn and, much to my surprise, saw two baby marmots. Upon looking around I found two more babies. I hurried home to tell my family of the discovery, and together we went over to watch them. After a few minutes the babies began to appear first came the four, then another, and finally three more. Eight baby marmots! They were very unsteady on their legs and fell all over each other as they played.
They seemed not to know the meaning of fear and paid no attention to us. Suddenly we heard a loud thumping of feet as one parent came rushing through the grass. The babies scurried into their home -- all except one curious little fellow. He apparently decided to have another look. All at once he let out a sharp squeal and backed into his home. I feel reasonably sure that mamma spanked.
After lunch we again went over to watch the babies and to count them once more. 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9--my daughter Sandy counted 10. Goodness, that just couldn't be -- ten in one family? There were two adults; these must have been the parents. Surely there wouldn't be two mothers and no father? They were all out now, playing like kittens. We counted again. Sure enough, there were ten. We sat about ten feet away, watching them play until the parents came home and shoved them in.
Much of the next three days was spent in taking pictures. I managed to get one which included all but two of the babies. By the end of the week they were venturing a hundred feet and more away from home.

Eight of the ten young marmots in the colony at Lost
Creek; one out of sight at the left of the photo.
The adults were doing a fine job of teaching. The youngsters became more timid and would scurry into their home when we approached. The only way of getting pictures after July 17th was to catch them unaware -- which was almost impossible -- or with a telephoto lens. And how I wished that I had such a lens!
The barn stands in a direct line of sight from our cabin. With binoculars we continued to watch the marmots from our door. They still played quite a bit, but they scurried home at the slightest sound.
By the 20th of July, the young went with the adults in search of food. Then we would see them only in the early morning and after 5:00 p.m. During the last week in July there was no sign of either young or adults. I feel that they must have moved elsewhere, due to the many attempts made by visitors to capture them.
On August 14, I was surprised to see one of the young sunning itself behind the barn. I haven't seen him since, although I have gone there frequently. I have seen evidence of many visits in which he returned with grass for his winter bed.
We have received so much pleasure from this marmot family that we hope very much to find another under the old barn next spring.
Editor's note: According to Victor H. Cahalane (1947. Mammals of North America. New York, The Macmillan Co. x, 682 pp.), a marmot litter usually numbers four or five and has extremes of three to eight. A family of ten for a single mother would be very exceptional, although perhaps possible. However, frequent and intensive observation convinced Mrs. Stine that one of the two adults was a male. Furthermore, the presence of two females in an area with no evidence of any male would be rather unexpected, especially in view of the fact that yellow-bellied marmots are quite sociable animals. If one assumes that the two adults observed here were not both females and each mothers of a litter, it is also possible that one was a mother caring for, in addition to her own, the offspring of a family whose mother was killed, while the other was the father. In any event, this observation is an unusual and intriguing one. --- R. M. B.