1. Better stay together: pair bond duration increases individual fitness independent of age-related variation by Oscar Sánchez-Macouzet, Cristina Rodríguez, and Hugh Drummond Proceedings B Volume 281(1786):20132843 July 7, 2014 ©2014 by The Royal Society

2. Lay date (proportional rank by season, 0 = earliest breeder and 1 = latest breeder) of male and female boobies during their fourth breeding event in life, in relation to pair bond duration (number of consecutive years with the current mate, 1 = first event... Oscar Sánchez-Macouzet et al. Proc. R. Soc. B 2014;281:20132843 ©2014 by The Royal Society

3. Reproductive parameters of male and female boobies during their fourth breeding event in life, in relation to pair bond duration. Oscar Sánchez-Macouzet et al. Proc. R. Soc. B 2014;281:20132843 ©2014 by The Royal Society

4. Lay date (a) and number of fledglings (b) produced by the focal birds of the main sample (grouped by pair bond duration at their fourth breeding event) at recruitment; and lay date (c) and number of fledglings (d) at the fifth breeding event of those focal... Oscar Sánchez-Macouzet et al. Proc. R. Soc. B 2014;281:20132843 ©2014 by The Royal Society