Article Harper's for Young People magazine--Anonymous author

It is very easy to study the habits of the sparrow, for it is so bold and sociable that if a little house is nailed up in a balcony, or by a window where people are constantly sitting, a pair of birds will at once take possession, bring twigs and bits of scattered threads and wool for a nest, and proceed to rear their noisy little family. Chirp, chirp, very loud and impatient, three or four little red open mouths appear at the door of the house, the parent birds come flying with worms and flies, and then for a little while the young ones take a nap and keep quiet, when, they wake up again and renew their clamor for food.

A brochure about how to attract birds so you can observe them would benefit from which quote from this magazine article?