Upside-down jellyfish lob tiny grenades to kill prey

This group of jellies, known as upside-down jellyfish, is a bit unusual. They don’t drift through the water, capturing prey in their long, trailing tentacles like their cousins. Instead, they lie on the ground and, with the help of stubby arms, they wave about all day in mangrove forests, seagrass beds, and other coastal habitats. Upside-down jellies get some of their nutrients from the symbiotic photosynthetic algae living inside their cells. However, they also feast on brine shrimp, nematodes, and other hapless creatures snared by the clouds of mucus they pump into the surrounding water. “It’s like dropping a ball of saliva while it’s still stuck to your lip and then being able to suck it back in,” Ames says.

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