Testosterone, plumage colouration and extra-pair paternity in male North-American barn swallows. by Cas Eikenaar, Megan Whitham, Jan Komdeur, Marco van der Velde, Ignacio T Moore

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Microbial environment shapes immune function and cloacal microbiota dynamics in zebra finches Taeniopygia guttata by H. Pieter J. van Veelen, Joana Falcão Salles, Kevin D. Matson, Marco van der Velde, B. Irene Tieleman

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The microbial environment modulates non-genetic maternal effects on egg immunity by H. Pieter J. van Veelen, Joana Falcão Salles, Kevin D. Matson, G. Sander van Doorn, Marco van der Velde, B. Irene Tieleman

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Gut microbiota of homing pigeons shows summer–winter variation under constant diet indicating a substantial effect of temperature by Maurine W. Dietz, Kevin D. Matson, Maaike A. Versteegh, Marco van der Velde, Henk K. Parmentier, Joop. A. J. Arts, Joana F. Salles, B. Irene Tieleman

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Three subspecies of Black-tailed Godwit share non-breeding sites in the world's largest river delta by Delip K. Das, Wouter M.G. Vansteelant, Bingrun Zhu, Shariful Islam, Naim Khandakar, Marco van der Velde, Chris J. Hassell, Jesse R. Conklin, Pierrick Bocher, Jos C.E.W. Hooijmeijer, Yvonne I. Verkuil, Theunis Piersma

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