棘

infraspinatus muscle

echinoderm

spiny ray (of a fin)

spinous process

Echinodermata (phylum of marine invertebrates)

bone spur

scapular spine

acanthodians (extinct jawed fishes)

stickleback (Gasterosteidae spp.)

sand sifting starfish (Astropecten polyacanthus)

poisonous spine

Muennink's spiny rat (Tokudaia muenninki)

spinocellular carcinoma

briars

Ryukyu spiny rat (Tokudaia osimensis)

Ryukyu spiny rat (Tokudaia osimensis)

barbed wire

threadfin butterflyfish (Chaetodon auriga)

ridge-tailed monitor (Varanus acanthurus)

black-headed monitor (Varanus tristis)

flat rock crab (Percnon planissimum)

wild rose

helmet crab (Telmessus acutidens)

there is no rose without a thorn