1.   The long spines of the sea urchins protect them from most predators.

2.   Their skin was stretched out between long spines, which seems to have acted as a cooling radiator.

3.   The sea urchin, a bottom feeder with long spines that looks like a pincushion, ate the large colonial algae that grew on and around the reefs.

4.   The vigorous tree has brown bark, green twigs, long spines, aromatic evergreen leaves and highly fragrant white blooms.

5.   This cactus bears long spines and large, bright yellow flowers at the plant crown on older plants in spring and summer.