 The diamond stingray is most active at night , spending much of the day buried in sand with only its eyes protruding . When foraging for food , it may be solitary but more commonly forms groups numbering up to the hundreds . There is strong segregation by sex and age . This species feeds on crustaceans , molluscs , and other invertebrates , as well as small bony fishes ; its powerful jaws and molar @-@ like teeth allow it to crush hard @-@ shelled prey . It mainly targets burrowing organisms , but may also take prey exposed on the bottom . There is a record of a female 69 cm ( 27 in ) across , that had gorged herself on at least 30 small crabs . In the Bahía Magdalena lagoon complex , Baja California Sur , its most important source of food are pea crabs , followed by the razor clam Solyema valvulus , and then polychaete worms . 
 The diamond stingray <a href='drop_aux' title='1'><mark>is</mark></a>most active at night , spending much of the day buried in sand with only its eyes protruding . When foraging for food , it may be solitary but more commonly <a href='uninflect' title='2'><mark>forms</mark></a> groups numbering up to the hundreds . <a href='dey_it' title='3'><mark>There</mark></a> is strong segregation by sex and age . This species <a href='uninflect' title='4'><mark>feeds</mark></a> on crustaceans , molluscs , and other invertebrates , as well as small bony fishes ; its powerful jaws and molar @-@ like teeth allow it to crush hard @-@ shelled prey . It mainly <a href='uninflect' title='5'><mark>targets</mark></a> burrowing organisms , but may also take prey exposed on the bottom . <a href='dey_it' title='6'><mark>There</mark></a> is a record of a female 69 cm ( 27 in ) across , that <a href='been_done' title='7'><mark>had</mark></a> gorged herself on at least 30 small crabs . In the Bahía Magdalena lagoon complex , Baja California Sur , its most important source of food <a href='drop_aux' title='8'><mark>are</mark></a>pea crabs , followed by the razor clam Solyema valvulus , and then polychaete worms . 
The diamond stingray most active at nite , spendin much of da day buried in sand with only its eyes protruding . When foraging fa food , it may b solitary but more commonly form groups numbering up to tdahundreds . It is strong segregation by sex and age . dis species feed on crustaceans , molluscs , and other invertebrates , as well as small bony fishes ; its powerful jaws and molar @-@ like teef allow it to crush hard @-@ shelled prey . It mainly target burrowing organisms , but may also take prey exposed on the bottom . It is a record of a female 69 cm ( 27 in ) across , dat done gorged herself on at least 30 small crabs . In the Bahía Magdalena lagoon complex , Baja California Sur , its most important source of food pea crabs , followed by thdaazor clam Solyema valvulus , and then polychaete worms .