Fuente http://people.eku.edu/ritchisong/bird_excretion.htm http://people.eku.edu/ritchisong/bird_excretion.htm (אנגלית) מאמר על הפרשות ציפורים "Avian osmoregulation" http://people.eku.edu/ritchisong/bird_excretion.htm http://people.eku.edu/ritchisong/bird_excretion.htm http://people.eku.edu/ritchisong/bird_excretion.htm http://people.eku.edu/ritchisong/bird_excretion.htm «Urinary System, Salt Glands, and Osmoregulation» http://people.eku.edu/ritchisong/bird_excretion.htm http://people.eku.edu/ritchisong/bird_excretion.htm http://people.eku.edu/ritchisong/bird_excretion.htm Fuente http://people.eku.edu/ritchisong/bird_excretion.htm people.eku.edu http://people.eku.edu/ritchisong/bird_excretion.htm http://people.eku.edu/ritchisong/bird_excretion.htm http://people.eku.edu/ritchisong/bird_excretion.htm http://people.eku.edu/ritchisong/bird_excretion.htm