Mountain lion? in Greenwich

On May 14 at 1pm my wife, while driving, saw what might have been a mountain lion jump onto and over a high stone wall on lower Lake Avenue in Greenwich CT. She saw a flash of tan, then large rear haunches on the top of the wall before it disappeared. Also a long tail, curving down then out.

The wall was on the west side of the avenue between Lauder Way and North Maple. Depending on the exact location, it was either 5.5 feet or 6 feet high.