On this occasion, he explained a little about the dragonfly that is eating its prey. In my opinion, the dragonfly can be said to be a polyphagous insect.

Taken By @Sward

In other words as an insect that eats many types of insects. even dragonflies eat insects of the same kind. Indeed, dragonflies are very fierce predators.

Dragonflies are predators, both in their aquatic larval stage, when they are known as nymphs or naiads, and as adults. Wikipedia : Dragonfly source

I observed when this dragonfly ate insects (flies) in a short time about 5 minutes after the dragonfly chewed the fly.

Then the mouth, I thought not wide, but when the dragonfly ate the fly, apparently its mouth was big when it ate flies.

However, dragonflies eat flies starting from the back of the fly, perhaps because they are softer when starting from the fly's buttocks. Strange but True.