Why male orangutans do not kill infants Lydia H. BeaudrotSonya M. KahlenbergAndrew J. Marshall Review Open access 21 July 2009 Pages: 1549 - 1562
Body size and reserve protection affect flight initiation distance in parrotfishes Kiyoko M. GotandaKatrine TurgeonDonald L. Kramer Original Paper 31 March 2009 Pages: 1563 - 1572
Male mating preference is associated with risk of pre-copulatory cannibalism in a socially polymorphic spider Jonathan N. PruittSusan E. Riechert Original Paper 24 March 2009 Pages: 1573 - 1580
On the consequences of aggressive male mate-locating behaviour and micro-climate for female host plant use in the butterfly Lycaena hippothoe Camille TurlureHans Van Dyck Original Paper 24 March 2009 Pages: 1581 - 1591
Movement signal choreography unaffected by receiver distance in the Australian Jacky lizard, Amphibolurus muricatus Richard A. PetersSimon J. Allen Original Paper 24 March 2009 Pages: 1593 - 1602
Utilization of a new host in the screaming cowbird Molothrus rufoaxillaris, a host specialist brood parasite: host switch or host acquisition? Bettina MahlerYanina Sarquis AdamsonJuan C. Reboreda Original Paper 31 March 2009 Pages: 1603 - 1608
Trans-Sahara migrants select flight altitudes to minimize energy costs rather than water loss Heiko SchmaljohannFelix LiechtiBruno Bruderer Original Paper 25 March 2009 Pages: 1609 - 1619
Nursing of own and foster offspring by Utah prairie dogs (Cynomys parvidens) John L. Hoogland Original Paper 22 April 2009 Pages: 1621 - 1634
Hierarchical perception of fertility signals and nestmate recognition cues in two dolichoderine ants Laurent CournaultJean-Christophe de Biseau Original Paper 09 May 2009 Pages: 1635 - 1641
Resource distributions affect social learning on multiple timescales Daniel J. van der PostBas UrsemPaulien Hogeweg Original Paper Open access 30 May 2009 Pages: 1643 - 1658
Helpers and egg investment in the cooperatively breeding acorn woodpecker: testing the concealed helper effects hypothesis Walter D. KoenigEric L. WaltersJoseph Haydock Original Paper Open access 20 May 2009 Pages: 1659 - 1665
The interplay between genetic and environmental effects on colony insularity in the clonal invasive little fire ant Wasmannia auropunctata Merav VonshakTamar DayanAbraham Hefetz Original Paper 23 May 2009 Pages: 1667 - 1677
Sperm viability staining in ecology and evolution: potential pitfalls Luke Holman Methods 07 July 2009 Pages: 1679 - 1688
Eigenbehaviors: identifying structure in routine Nathan EagleAlex Sandy Pentland Erratum 21 July 2009 Pages: 1689 - 1689
Disentangling the effects of group size and density on shoaling decisions of three-spined sticklebacks (Gasterosteus aculeatus) Joachim G. FrommenMeike HiermesTheo C. M. Bakker Erratum 22 July 2009 Pages: 1691 - 1691