Canal de Castilla Rey (Palencia), considered the beginning of the Northern Branch, Valladolid and Medina de Rioseco, lying at the end of the Southern Branch and Campos Branch respectively. The countryside crossed by the canal is of interest for its birdlife. In the Tierra de Campos there are two large Special Protection Areas ("La Nava-Campos Norte" and "La Nava-Campos Sur") which are notable for the birds such as great bustards ("Otis tarda") which live in the dryland farming areas (sometimes described as "steppes") which are typical of the region. The canal, on the other hand, provides habitats for wetland birds such as the
Little Birds 'little birds' of the title story refer both to the actual birds used by its exhibitionist protagonist to attract young schoolgirls to his attic, and (metaphorically) to the girls' flight when he finally exposes himself. In other stories, Nin calls into question the objectifying tendencies of the male gaze; both male and female complicity in masochism; and the pornographic genre itself through her subtle subversion. While writing her erotica, and organising that of her fellow writers such as George Barker, Nin referred to herself jokingly as the "madam of this snobbish literary house of prostitution" for a client who examined