Yellow-billed Cuckoo (Coccyzus americanus) Science Article 1
This paper describes characters by which nestling Yellow-billed and Black-billed Cuckoos can be distinguished. It is based on a small collection that I made at Bloomington, Indiana, before I discovered Herrick’s paper. The nests from which I took the birds presented no anomalies.
VAL NOLAN, JR., Condor(77)3:341