G'day,
http://www.askabiologist.org.uk/answers … p?id=14267

Those squiggles weren't very big. The red line in the image represents about 15cm. Although I'm frequently beachcoming, various beaches, this was the first time I came across something like that.

Regards,
Christina
(Tasmania)

Post's pictures

Squiggles in sand.jpg, 1.09 mb, 1600 x 1200

Hmm, no idea to be honest. The discrete nature of them, and what might be burrows makes me assuem it is something coming out of the sand and popping back in. The tracks are well defined so I'd hazard a guess whatever makes them has a hard shell of some kind (a mollusc or arthropod) but basically... no clue!

Take a spade if you go back there and see if you can dig one up!