Active and effective nest defence by males in a social apoid wasp Eric R. LucasJeremy Field Original Paper 03 March 2011 Pages: 1499 - 1504
Predation risk makes bees reject rewarding flowers and reduce foraging activity Emily I. JonesAnna Dornhaus Original Paper 03 March 2011 Pages: 1505 - 1511
Effects of male sexual harassment on female time budgets, feeding behavior, and metabolic rates in a tropical livebearing fish (Poecilia mexicana) Antonia KöhlerPhilipp HildenbrandMartin Plath Original Paper 10 March 2011 Pages: 1513 - 1523
Age and sex influence marmot antipredator behavior during periods of heightened risk Amanda J. LeaDaniel T. Blumstein Original Paper Open access 11 March 2011 Pages: 1525 - 1533
Male takeover, infanticide, and female countertactics in white-headed leaf monkeys (Trachypithecus leucocephalus) Qing ZhaoCarola BorriesWenshi Pan Original Paper 04 March 2011 Pages: 1535 - 1547
Parental favouritism strategies in the asynchronously hatching European Roller (Coracias garrulus) Jesús M. AvilésDeseada ParejoJuan Rodríguez Original Paper 12 March 2011 Pages: 1549 - 1557
Body morphologies shape territorial dominance in the satyrine butterfly Lethe diana Tsuyoshi Takeuchi Original Paper 03 March 2011 Pages: 1559 - 1566
Promiscuous behaviour disrupts pregnancy block in domestic horse mares Luděk BartošJitka BartošováJana Šindelářová Original Paper 26 March 2011 Pages: 1567 - 1572
Group leadership depends on energetic state in a nomadic collective foraging caterpillar Melanie McClureMelissa RalphEmma Despland Original Paper 10 March 2011 Pages: 1573 - 1579
Individual specific contact calls of pallid bats (Antrozous pallidus) attract conspecifics at roosting sites Bryan D. ArnoldGerald S. Wilkinson Original Paper 15 March 2011 Pages: 1581 - 1593
The genetic mating system of a sea spider with male-biased sexual size dimorphism: evidence for paternity skew despite random mating success Felipe S. BarretoJohn C. Avise Original Paper Open access 12 March 2011 Pages: 1595 - 1604
Three beetles—three concepts. Different defensive strategies of congeneric myrmecophilous beetles Michael StoefflerTill TolaschJohannes L. M. Steidle Original Paper 12 March 2011 Pages: 1605 - 1613
Testing the priority-of-access model in a seasonally breeding primate species Constance DubucLaura MunizAnja Widdig Original Paper Open access 25 March 2011 Pages: 1615 - 1627
Deflective effect and the effect of prey detectability on anti-predator function of eyespots Adrian VallinMarina DimitrovaSami Merilaita Original Paper 15 March 2011 Pages: 1629 - 1636
Asymmetric mate choice, hybridization, and hybrid fitness in two sympatric grasshopper species Axel HochkirchIsgard Lemke Original Paper 29 March 2011 Pages: 1637 - 1645
Context-dependent effects of nestling growth trajectories on recruitment probability in the collared flycatcher Gergely HegyiBalázs RosivallJános Török Original Paper 22 March 2011 Pages: 1647 - 1658
Determining association networks in social animals: choosing spatial–temporal criteria and sampling rates Hamed HaddadiAndrew J. KingAlan M. Wilson Methods 03 May 2011 Pages: 1659 - 1668