Dr Steve Portugal

  1. Article › Research › Peer-reviewed
  2. Published

    Visual fields, foraging and collision vulnerability in Gyps vultures

    Martin, G. R., Portugal, S. J., Murn, C. P. & Portugal, S., 1 Jul 2012, In: Ibis. 154, 3, p. 626-631 6 p.

    Research output: Contribution to journalArticlepeer-review

  3. Published

    Visual scoring of eggshell patterns has poor repeatability

    Brulez, K., Choudhary, P. K., Maurer, G., Portugal, S. J., Boulton, R. L., Webber, S. L., Cassey, P. & Portugal, S., 1 Jul 2014, In: Journal of Ornithology . 155, 3, p. 701-706 6 p.

    Research output: Contribution to journalArticlepeer-review

  4. E-pub ahead of print

    Weak asymmetric interspecific aggression and divergent habitat preferences at an elevational contact zone between tropical songbirds

    Jones, S., Tobias, J., Freeman, R. & Portugal, S., 26 Oct 2019, (E-pub ahead of print) In: Ibis. p. 1-29 29 p.

    Research output: Contribution to journalArticlepeer-review

  5. E-pub ahead of print

    When flocking is costly: reduced cluster-flock density over long-duration flight in pigeons

    Sankey, D. & Portugal, S., 15 Jul 2019, (E-pub ahead of print) In: The Science of Nature . 106, p. 1-5 5 p., 47.

    Research output: Contribution to journalArticlepeer-review

  6. Published

    White‐headed Vulture Trigonoceps occipitalis shows visual field characteristics of hunting raptors

    Portugal, S., Murn, C. & Martin, G., Apr 2017, In: Ibis. 159, 2, p. 463–466 4 p.

    Research output: Contribution to journalArticlepeer-review

  7. Published

    Why are birds' eggs colourful? Eggshell pigments co-vary with life-history and nesting ecology among British breeding non-passerine birds

    Cassey, P., Thomas, G. H., Portugal, S. J., Maurer, G., Hauber, M. E., Grim, T., Lovell, P. G., Mikšík, I. & Portugal, S., 1 Jul 2012, In: Biological Journal of the Linnean Society. 106, 3, p. 657-672 16 p.

    Research output: Contribution to journalArticlepeer-review

  8. Published

    Wild geese do not increase flight behaviour prior to migration

    Portugal, S. J., Green, J. A., White, C. R., Guillemette, M., Butler, P. J. & Portugal, S., 23 Jun 2012, In: Biology Letters. 8, 3, p. 469-72 4 p.

    Research output: Contribution to journalArticlepeer-review

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