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
Two Little Dickie Birds out of sight of the child, will mark in some conspicuous way the nail of the index finger of one hand and the nail of the second finger of the other hand. Both hands are then shown to the child as fists (folded fingers downwards) with the two fingers with marked nails pointing forward – these represent Peter and Paul. As the rhyme is recited, the hand actions are: Two Little Dickie Birds "Two Little Dickie Birds" or "Two Little Black Birds" is an English language nursery rhyme and fingerplay. It has a Roud Folk Song Index number of 16401.