Giant Bee-Eaters look very much like deep sea Angler fish. They appear to be large, but relatively harmless nocturnal insectivores, using a long dangling lure with a glowing tip sprouting from their noses.
They can reach in excess of 50 feet long. Though their diet consists primarily of bugs, they will willingly ingest and other creature that gets trapped in their mouths as they float over the forests.
To note: the info box in How to Break a Dragon's Heart indicates they are vegetarian, but this is not accurate since they eat mostly bees and other insects.