A Menlo mystery: Where did this big bone come from?

A mystery turned up in our front yard recently. Next door, a home is being extensively remodeled, which  has required a lot of digging.

We’re guess that’s when this big bone was unearthed somewhere along the property line.

This much we know:

• This neighborhood was developed in the early 50s.
• We presume it was field land before then, with San Francisquito Creek a short distance away.
• The bone is a femur.
• It measures 15 inches long.

Any guesses where/what animal it’s from?

Photo by Linda Hubbard (c) 2015