Dragonfly larvae are evil and I hate them

Ewww eww eww eww ewwwwwwww !

Dragonfly larvae might be the tigers of the water-weed jungle, but they were not thought to attack adult frogs. The new study indicates that they do, at least occasionally. The voracious larvae climbed out of their ponds onto water plants, then leapt onto the frogs and began eating them alive, while the frogs tried unsuccessfully to escape.

But dragonfly involvement in using vertebrates as victuals does not end there. Now and again, adult dragonflies also get in on the act. For instance, there is a remarkable photo of a large Canadiandragonfly called a dragonhunter that caught a ruby-throated hummingbird in mid-air and began to feed on it.

In a study published in 2014, Dragan Arsovski and colleagues reported that they had found a female horn-nosed viper dead, with its stomach burst open. The 20cm-long animal had rather rashly decided to swallow a live 15cm Scolopendra. This turned out to be a mistake: the centipede seems to have eaten all the snake's internal organs, then tried to chew its way to freedom through the snake's body wall. As you can see from the picture, it very nearly made it.

Look at any body of water in summer and you will see long-legged insects, skittering between pond weeds, dimple-balanced on the water surface. They feed by sucking the innards out of drowning insects. But below the water surface, concealed in weeds and dead leaves, lurk waterscorpions: 2-cm-long ambush predators that eat whatever comes into reach. In the tropics these insects are scaled up, becoming the giant water bugs. The largest species reach 12cm.

They conceal themselves in vegetation and then pounce. They have a stout, tube-like proboscis with which they can impale their prey, inject digestive juices and then suck up the resulting "soup". Large, hook-like, front legs make sure there is little chance of escape. Giant water bugs eat a lot of fish and tadpoles, as well as adult frogs and water snakes. There is even a report of a baby terrapin falling prey.

Lovely.
http://www.bbc.com/earth/story/20170118-monstrous-spiders-and-centipedes-that-prey-on-large-animals