routes of migratory birds
They are not really looking at birds' nests, except as part of the counting process. The study of migration includes where birds spend the different seasons, the routes they take and how they navigate.
follow your teacher's instructions, and don't take shortcuts
the plural of route is routes. As in "there are plenty of routes to take".
Military forces followed river routes because they wanted the attacks to be a surprise. For example, George Rogers Clark launched an attack in the icy Wabash River in 1779 because no one thought he was going to take such a risk.
some birds take rest.
he set examples for other presidents to follow
No there are no routes for this.
he took
So that they can find out what is in that area and what inhabitants live there.
Yes. There are overland routes and sea routes that will take you from Thailand to the U.K.
the birds take a winter holiday because it will be cold in their place.
It's a map with routes to look at. They are pokewalker routes to take strolls on with your pokemon.