Just happened to catch my smaller Starfish upside down and snapped some pix. Never seen them do that before. The other is the larger (3")Starfish who seems to go inside that shell it seems ofter.
4 by Phastroh1, on Flickr
2 by Phastroh1, on Flickr
1 by Phastroh1, on Flickr
3 by...