This unsettling creature is a hydra, a freshwater-dwelling cnidarian no more than a half-inch long that eats mostly insect larvae and crustaceans. A hydra’s appearance and eating habits alone ...

particularly as they grow from ovoid-shaped swimming larvae to sedentary, tubular polyps. This morphological transformation is a fundamental transition in the life history of many cnidarian ...

Unusually elastic protein found by researchers; may have originated in cnidarian elastomer. ScienceDaily . Retrieved June 2, 2025 from www.sciencedaily.com / releases / 2015 / 01 / 150123110715.htm ...