sentences:  Here, four species consisting of saker falcons, western marsh harrier ("Circus aeruginosus"), black-winged kite ("Elanus caeruleus") and Eurasian sparrowhawk ("Accipiter nisus") as well as red foxes were all robbed of their catches with a remarkable degree of success by imperial eagles.The eagles so heavily depleted the falcons catches that the falcons’ nesting attempts failed.A still swifter falcon than the saker, the peregrine falcon ("Falco peregrinus") was observed successfully robbing imperial eagles and a few other raptorial birds several times when the species nested near each other in the lower Sakmara river of Russia (although in one case, a juvenile peregrine was killed by the golden eagle it was attempting to rob).