(1) Surprisingly, one way that such males can acquire a mate is to kill the young nestlings and then pair with the female who has to start a new family.(2) So why do superb fairy-wrens appear to be unique in their ability to desert cuckoo nestlings ?(3) Birds not ringed as nestlings were aged and sexed according to the method of Jenni and Winkler.(4) This is fortunate, because house wren nestlings have prodigious appetites.(5) In one nest, some nestlings died before 7 days of age and were therefore excluded from the analysis.(6) All nests that contained eggs or nestlings were classified as occupied.(7) They are very aggressive and are able to take over nests and kill the eggs and nestlings of other birds.(8) Supposedly, martens use a nest-box as a search image while hunting for nestlings and adult birds.(9) At the end of the food deprivation period, we removed all nestlings from their nests and put them in a cloth bag.(10) Females built the nest and incubated alone, but both parents fed nestlings and fledglings.(11) All nestlings were returned to their home nests at the end of each trial.(12) It's the first study to show that birds have learned to recognize and reject cuckoo nestlings .(13) On our way out of campus, we stopped by Shroud and Bev's apartment to check on the House Finch nestlings .(14) We provided food supplements to half of the nestlings in each nest during the nestling period.(15) They scavenge for carrion and garbage and also prey on rodents and on the eggs and nestlings of other birds.(16) Birds were ringed as nestlings or when breeding and measured using standard procedures.