Riddle Lake Tompson 266. Yellowstone July 2, 1932. Trip to Riddle Lake with Wright and McCarthy, ranger from Norris. Only a blazed trail leads in, from the S. Firbad, about 4 mile south of continental divide. Mosquitos very light, as they have been everywhere this year. Arriving at the south end of the lake we saw nothing but marshy country, gradually opening into the lake proper. It is an ideal swans & crane lake. An old beaver house was in the south marsh. Grass & rushes predominate with a large scattering of pond lilies. The lake appears to be quite shallow. At the north end, we saw a pair of swans with 4 cygnets, very young, They were wary, & started moving away when we were 1/2 mile away. We had been at the lakes over an hour searching it carefully with binoculars before we saw the swans. They should be successful at this lake. Other birds seen on the lake: mallards - 100 bald eagle - 1 gadwalls - many. Barrows Goldeneye - few Bufflehead - 1 pair Loon - 1 Green-wing teal - 1 pair Koots - several