Tree Trappers.
"The birds who feed on insects which lurk about the trunks and branches of trees and shrubs.
"3.

Sky Sweepers.
"The birds who, while on the wing, catch flying insects.
"4.

Wise Watchers.
"The large, silent birds, who sit in wait for their prey of field-mice and other little gnawing mammals, as well as insects.
"5.

Seed Sowers.
"The birds who eat wild fruits and berries, and after digesting the pulp and juice, sow the seeds with their bodily wastage.
"6.

Weed Warriors.
"The birds who crack seeds in their stout beaks, eat the kernels, and so destroy millions of harmful weed-seeds.
"You must write the names and definitions of these six guilds down in your books, because when you hear about each bird I will tell you to which guild he belongs, and if you know where and upon what a bird feeds it will be easier for you to find him.