spines

Blackberry Rubus fruticosa showing flowers, ripe and unripe fruit, and a leaflet

Barberry Burberis vulgaris with red berries, yellow flowers and spiny twigs

Hedgehog Erinaceus europaeus in profile, with grass below

Three-spined stickleback Gasterosteus aculeatus male with background weed

Three-spined stickleback Gasterosteus aculeatus male

Fish anatomy diagram simplified exterior and interior cross section view