“…Although terns and other seabirds are often assumed to be highly philopatric, the degree of site fidelity varies substantially both between species (McNicholl, 1975;Møller, 1982;Burger, 1984;Erwin et al, 1998;Renken and Smith, 1995;Ward et al, 2011;Ledwón et al, 2013;Zarza et al, 2013) and between colony sites within species (Austin, 1949;Haymes and Blokpoel, 1978;Tims et al, 2004;Spendelow et al, 1995;Feare and Lesperance, 2002;Lebreton et al, 2003;Sánchez et al, 2004;Shealer et al, 2005;Devlin et al, 2008;Ratcliffe et al, 2008;Draheim et al, 2010). Most measures of philopatry are probably biased toward high values because it is difficult to detect individuals who disperse (Coulson and Coulson, 2008).…”