most migratory

Using observation records and data collected through bird banding, 20th-century ornithologists roughly mapped general migration routes and timing for most migratory species.

And while their range is much smaller than most migratory species, it can extend 600 square kilometers or more.

Most migratory insects around the world are pests, such as locusts, but luckily for U.K. farmers, the hoverflies are friends.

Most migratory birds fly at night.

Scientists can still only guess at the cumulative impact of all this light pollution on bird populations, but with numbers of most migratory bird species in decline, it probably isn't good.