David Perpinan / Group of Griffon vultures (Gyps fulvus) fighting to feed on a dead lamb. Cuenca, Spain, August.

David Perpinan / Group of Griffon vultures (Gyps fulvus) arriving and feeding on a dead lamb, Cuenca, Spain, August.

Dave Bevan / Welsh mountain sheep cleaning afterbirth from a lamb before a second lamb is born, Carmarthenshire, Wales, UK, March.

Michael Quinton / Dall's Sheep (Ovis dalli) ram, lamb, and ewe, Yukon Territory, Canada

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, ewe, and lamb, western Canada

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ewes and lambs grazing, western Canada

Ernie Janes,Ernie Janes / Lambs in meadow in spring, UK, April

Ernie Janes / Spring lambs in meadow, UK, April

Gerrit Vyn / Dall sheep (Ovis dalli) yearling lamb running across alpine tundra, Denali National Park, Alaska, USA

Laurie Campbell / Black-faced sheep (Ovis domesticus) ewe with lamb, Lanarkshire, Scotland, April

Brent Stephenson / Domestic Sheep (Ovis aries) ewe and two lambs, probably Romney x Perendale. Unshorn. Cape Kidnappers, Hawkes Bay, New Zealand, September.

Diane McAllister / Female Rocky Mountain bighorn sheep ewe (Ovis canadensis canadensis) warning her newborn lamb that a rocky ledge is too close and dangerous. She places her front hoof on the baby's back, stopping it f...