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Yes, they can sting.
more from the same site:
"Hydras, like their relatives the jellyfish and sea anemones, have stinging cells with which they capture their prey. Each stinging cell is a rounded cell with a hollow coiled thread inside that can be shot out at great speed. Hydra has four kinds. The first thread injects a poison. The second kind when shot out, if the prey has bristles, becomes entangled in it. The third is probably defensive, and the fourth is used to fasten the tentacles when the hydra is walking.
When a cell is discharged, its thread is forced inside out. the cells used in capturing the prey are discharged when the prey touches a little trigger on the cell. Touch, however, is not enough, for the stinging cell must also be stimulated by chemicals in the water that are given out by the prey."
more from the same site:
"Hydras, like their relatives the jellyfish and sea anemones, have stinging cells with which they capture their prey. Each stinging cell is a rounded cell with a hollow coiled thread inside that can be shot out at great speed. Hydra has four kinds. The first thread injects a poison. The second kind when shot out, if the prey has bristles, becomes entangled in it. The third is probably defensive, and the fourth is used to fasten the tentacles when the hydra is walking.
When a cell is discharged, its thread is forced inside out. the cells used in capturing the prey are discharged when the prey touches a little trigger on the cell. Touch, however, is not enough, for the stinging cell must also be stimulated by chemicals in the water that are given out by the prey."