Consider the migration of a dragonfly, a wandering glider, that migrates thousands of miles over continents and across oceans. We’re talking about a 1.5-inch-long insect weighing 400 milligrams or ...

In the spring and summer, I see swallows swooping in the air, presumably to eat flying insects – so why are the insects way up there? • There may be several reasons why insects fly high and risk ...