"Wherrys are predatory avians, they were the major hunter/scavangers on the planet and killed large numbers of the smaller imported animals during the first months of settlement." "Their bodies are covered with thick proto-feathers, multiple tufts like marabou." "Wherries nested in caves or rocky out croppings, much as earth seabirds do. They ate fish carrion, tunnel snakes, insects, offal, or garbage." Taken from: p13-14 in The Dragonlovers Guide to Pern.