I work at Old Silver Beach in Falmouth MA and we definitely found what appeared to be the remains of a lower leg including the knee and the tibia and fibula (both which appeared to be sawed off a few inches above the ankle). It was just bone with some cartilage.
The police were called in and they took it to the hospital where a pathologist confirmed it belonged to a human female using some acid and pH tests.
The weird thing is though, is that no crime scene investigators arrived after the positive results and then later in the day, an officer tried to tell me that it was a portion of a baby seal.
weird.