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Looks just like a crayfish but it can't be. 13cm end to end.
Coastal. Was found washed up on the shore near rocks.
Found at Peron, Western Australia near Rockingham.
Pelvis from either a cormorant or shag:
https://www.flickr.com/photos/jrochester...
Definitely a bird pelvis. Could be from a gull or water fowl of some kind! It will be difficult to get an ID but not impossible. Start with what other birds of similar size are in the area! Cheers and thanks for sharing!
I also have what looks like an ulna bone, I saw another spotting where someone had added this link: http://courses.washington.edu/chordate/4...
Wow I just searched "pelvic bone of a seagull" and pictures came up very similar, any idea on finding out which one. Will do some bird watching when in the area next. Thanks Redrock :)
This could go in the Identifying Animals Through Osteology mission at http://www.projectnoah.org/missions/8475...