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Hello @lide203. I can't speak spanish. Google-translate might help...
I think this is a hermit crab in a snail shell. I have taken this picture on a trip next to Noosa Heads.

@aboutsun It's a very good photograph, I loved the angle you used

@thesunphoto10 thank you! It was also not that easy to take this picture because of the hermit crab... several times it pinched me :D

Sii es un cangrejo ermitaño recuerdo cuando era chico me gustaba buscarlos entre las rocas de la costa