National Geographic : 1999 Jan
Absolutely ravenous,chicks clamorforfood 50feet up a quaking aspen in Idaho. Running an endless shuttle, their parentsstuffed the week-old chicks with carcassmeat, insects, rodents,worms, and eggs of other birds.But the nest is no sure haven. On the nestlings' 26th day of life, two vanished and threeperished on the ground (below), perhapspecked to death and tossed out by aggressiveyoung ravens seeking to usurp the residentpair's territory. In anothernest (above) an interlopermates with the female. Cuckoldry can occureven while a male is outpro claiming his territorywith his calls. Egg clutches of three to seven eggs are sometimesfertilized by two or more males, yet the bonded pairremains together.