Nicoladis, E.; Pika, S.; Marentette, P. F.: Do French-English bilingual children gesture more than monolingual children? Journal of Psycholinguistic Research 38 (6), pp. 573 - 585 (2009)

Nicolaus, M.; Michler, S. P. M.; Ubels, R.; van der Velde, M.; Komdeur, J.; Both, C.; Tinbergen, J. M.: Sex-specific effects of altered competition on neslting growth and survival: An experimental manipulation of brood size and sex ratio. Journal of Animal Ecology 78 (2), pp. 414 - 426 (2009)

Pereira, M. J. R.; Marques, J. T.; Santana, J.; Santos, C. D.; Valsecchi, J.; de Queiroz, H. L.; Beja, P.; Palmeirim, J. M.: Structuring of Amazonian bat assemblages: The roles of flooding patterns and floodwater nutrient load. Journal of Animal Ecology 78 (6), pp. 1163 - 1171 (2009)

Perfito, N.; Bentley, G. E.: Opportunism, photoperiodism, and puberty: Different mechanisms or variations on a theme? Integrative and Comparative Biology 49 (5), pp. 538 - 549 (2009)

Peters, G.; Baum, L.; Peters, M. K.; Tonkin-Leyhausen, B.: Spectral characteristics of intense mew calls in cat species of the genus Felis (Mammalia: Carnivora: Felidae). Journal of Ethology 27 (2), pp. 221 - 237 (2009)

Pika, S.: Our grooming cousins: Providing the link to declarative signalling? Studies in Communication Sciences 9, pp. 73 - 102 (2009)

Poisbleau, M.; Demongin, L.; Angelier, F.; Dano, S.; Lacroix, A.; Quillfeldt, P.: What ecological factors can affect albumen corticosterone levels in the clutches of seabirds? Timing of breeding, disturbance and laying order in rockhopper penguins (Eudyptes chrysocome chrysocome). General and Comparative Endocrinology 162 (2), pp. 139 - 145 (2009)

Poisbleau, M.; Demongin, L.; Trouve, C.; Quillfeldt, P.: Maternal deposition of yolk corticosterone in clutches of southern rockhopper penguins (Eudyptes chrysocome chrysocome). Hormones and Behavior 55 (4), pp. 500 - 506 (2009)

Poisbleau, M.; Guillemain, M.; Demongin, L.; Carslake, D.; David, J.: Within-brood social status and consequences for winter hierarchies amongst Mallard Anas platyrhynchos ducklings. Journal of Ornithology 150 (1), pp. 195 - 204 (2009)

Quillfeldt, P.; Everaert, N.; Buyse, J.; Masello, J. F.; Dridi, S.: Relationship between plasma leptin-like protein levels, begging and provisioning in nestling thin-billed prions Pachyptila belcheri. General and Comparative Endocrinology 161 (2), pp. 171 - 178 (2009)

Quillfeldt, P.; Masello, J. F.: Dünnschnabel-Walvögel: "Mini-Albatrosse" messen Klimawandel im Südpolarmeer. Jahrbuch - Max-Planck-Gesellschaft (2009)

Quillfeldt, P.; McGill, R. A. R.; Masello, J. F.; Poisbleau, M.; van Noordwijk, H. J.; Demongin, L.; Furness, R. W.: Differences in the stable isotope signatures of seabird egg membrane and albumen - Implications for non-invasive studies. Rapid Communications in Mass Spectrometry 23 (23), pp. 3632 - 3636 (2009)

Quillfeldt, P.; Poisbleau, M.; Chastel, O.; Masello, J. F.: Acute stress hyporesponsive period in nestling Thin-billed prions Pachyptila belcheri. Journal of Comparative Physiology A-Neuroethology Sensory Neural and Behavioral Physiology 195 (1), pp. 91 - 98 (2009)

Quispe Valdez, R.; Villavicencio, C. P.; Cortes, A.; Vásquez, R. A.: Inter-population variation in hoarding behaviour in degus, Octodon degus. Ethology 115 (5), pp. 465 - 474 (2009)

Rattenborg, N. C.; Martinez-Gonzalez, M. D.; Lesku, J. A.: Avian sleep homeostasis: Convergent evolution of complex brains, cognition and sleep functions in mammals and birds. Neuroscience and Biobehavioral Reviews 33 (3), pp. 253 - 270 (2009)

Reidy, J. L.: Nest predators of Lance-tailed Manakins on Isla Boca Brava, Panamá. Journal of Field Ornithology 80 (2), pp. 115 - 118 (2009)

Reinhardt, A.; Bauer, H.-G.: Analyse des starken Bestandsrückgangs beim Waldlaubsänger Phylloscopus sibilatrix im Bodenseegebiet. Vogelwarte - Zeitschrift für Vogelkunde 47 (1), pp. 23 - 39 (2009)

Roberts, M. L.; Peters, A.: Is testosterone immunosuppressive in a condition-dependent manner? An experimental test in blue tits. The Journal of Experimental Biology 212 (12), pp. 1811 - 1818 (2009)

Roberts, M. L.; Ras, E.; Peters, A.: Testosterone increases UV reflectance of sexually selected crown plumage in male blue tits. Behavioral Ecology 20 (3), pp. 535 - 541 (2009)

Romanczuk, P.; Couzin, I. D.; Schimansky-Geier, L.: Collective motion due to individual escape and pursuit response. Physical Review Letters 102 (1), 010602 (2009)