Turtle puzzle

My kid loved these dinosaur puzzles: https://www.thingiverse.com/thing:1163973

So here is my first attempt at a similar kind of puzzle. We liked it best when the pieces locked into place so the puzzle could be scooted around on the floor without coming apart. With this puzzle the pieces fit tightly, maybe a little too tightly, but my tester didn't really have any trouble getting it together. Still, if I make another, I'll go for a little looser.