What Happened to My Turtle??!!

Anybody who has a farm at Farmville will recognise the pictures below. I do not have a virtual farm.. but I maintain some of my friends/relatives until a certain level. Don't ask me why.. haha.

Recently while at someone's farm, I noticed that one of the turtles was missing.

When I moved my cursor to the spot where the turtle was supposed to be, it showed a green square.

The other animals... like this rabbit, are okay.

I'm not sure if the turtle appeared later, I didn't check. Maybe one of my neighbours stole it and made turtle soup out of it...hmmmm..