Beak & Claw Beak & Claw Beak & Claw is the debut EP by Sisyphus (released under the name S / S / S), a collaborative project between Serengeti, Sufjan Stevens, and Son Lux. It was released through Anticon on March 20, 2012. If featured guest appearances from Shara Worden and Doseone. At Metacritic, which assigns a weighted average score out of 100 to reviews from mainstream critics, the EP received an average score of 64% based on 6 reviews, indicating "generally favorable reviews". Austin Trunick of "Under the Radar" gave the album 3 stars out of 10, saying, ""Beak & Claw" is
Psittacine beak and feather disease Psittacine beak and feather disease Psittacine beak and feather disease (PBFD) is a viral disease affecting all Old World and New World parrots. The causative virus–"Beak and feather disease virus" (BFDV)—belongs to the taxonomic genus "Circovirus", family "Circoviridae". It attacks the feather follicles and the beak and claw matrices of the bird, causing progressive feather, claw and beak malformation and necrosis. In later stages of the disease, feather shaft constriction occurs, hampering development until eventually all feather growth stops. It occurs in an acutely fatal form and a chronic form. Cracking and peeling of the outer layers of the claws