As Kristine Malone stood on a crowded train platform in New York City, a strange sound suddenly caught her attention. Faint, desperate cries were rising from somewhere below the tracks.
She leaned over the edge and searched the gravel and steel, trying hard to figure out where the sound was coming from. At first, she saw nothing at all.
Then she spotted it: a tiny orange ball of fuzz tucked between the rocks near the wall…