bird rock

[spanish hill hunter]

hi folks...i posted this a couple of years ago with a poor resolution camera and didn`t get many to opine..I got a new camera so would like to try again..I found this rock with an imprint of 2 birds into it..I doesn`t have any bone structure and was thinking more along the line of an external mold fossil..Thanks in advance

 

[Roger Mn.]

I see a rattlesnake on the right holding on to one bird.
roger