Sentence:  Behind him, old Akthoob was grumbling loudly, saying something about the midday meal, and Haral, the black Feridoon pony, snuffing in the old, familiar scent of the green meadows of the Chaya's banks, the warm sweet smells of home, was <WSD>nickering</WSD> eagerly. 
Meaning of the word marked with <WSD> tags:  To make a soft neighing sound characteristic of a horse.