Osiejuk, T.S., Olech, B., Ratynska, K., Owsinski, A. & Gromadzka-Ostrowska, J. 2004. Effects of season, plasma testosterone and body size on corncrake (Crex crex) call rhythm. Ann. Zool. Fennici. 41: 647-659.
and Polish Journal of Ecology:
Rutkowska-Guz, J. M. & Osiejuk, T.S. 2004. Song structure and variation in Yellowhammers Emberiza citrinella from western Poland. Pol. J. Ecol. 52: 327-339.
Tomasz ______________ Current address:
Tomasz S. Osiejuk, PhD Visiting Scholar
Cornell Lab of Ornithology Bioacoustic Research Program 159 Sapsucker Woods Rd. Ithaca, NY 14850, USA Email: [EMAIL PROTECTED]
