60
Found an old notebook doodle
(sh.itjust.works)
Lined notepad with the date "13/09/16" (sorry about the format) and some todo notes cut off. The subject is a pile of shaded rocks, with a small bird atop one, tweeting. This is echoed by a rock with a vague mouth shape, that is shown to be emitting a cry also.
It reminds me of that rock alien from Galaxy Quest.