About Pachyptila belcheri (Mathews, 1912)
Like all prions, Pachyptila belcheri (slender-billed prion) are blue-grey on their upper body and white on their lower body, with a dark "M" marking stretching from their back to their wingtips. They have a white eyebrow stripe and a dark line that extends from below the eye almost to the neck. Their tail is wedge-shaped, grey with a black tip; their bill is blue-grey, and their feet are pale blue. Slender-billed prions spend all of their non-breeding time over ocean waters in the southern oceans. When breeding, they nest on the Crozet Islands, the Kerguelen Islands, the Falkland Islands, and Noir Island off the coast of southern Chile. Like all prions, slender-billed prions eat zooplankton, which they filter out through their bill.
