“…Indeed, in those birds in which olfactory thresholds have been determined, sensitivities to odors are similar to those of some mammals [Clark et al, 1993;Smith and Paselk, 1986;Snyder and Peterson, 1979;Stattleman et al, 1975;Waldvogel, 1989;Walker et al, 1986]. Behavioral studies have also demonstrated that olfaction is important in mediating many types of behaviors, including navigation [Holland et al, 2009;Papi, 1990;Wallraff, 2003Wallraff, , 2004, reproduction [Hagelin et al, 2003;Whitta ker et al, 2013], individual recognition [Bonadonna and Nevitt, 2004;De Leon et al, 2003], nest recognition [Bonadonna and Bretagnolle, 2002;Bonadonna et al, 2003aBonadonna et al, , b, 2004, communication [Hagelin et al, 2003], and mate choice [Whittaker et al, 2011.…”