• Rumpf, M. & Tzschentke, B. (2010) "Perinatal Acoustic Communication in Birds: Why Do Birds Vocalize in the Egg?" The Open Ornithology Journal 3:141-149

  • Greenwood, J.J.D. (1964) "The fledging of the Guillemot Uria aalge with notes on the Razorbill Alca torda" Ibis 106:469-481
    [notes]
    http://dx.doi.org/10.1111/j.1474-919X.1964.tb03728.x


Links