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Is male care compromised by additional mating opportunity
It is concluded that, in spite of the paucity of comprehensive studies, this tradeoff has a potentially important and often overlooked influence on parental behaviour in a range of taxa. Expand
Maternal Effects Contribute to the Superior Performance of Extra-Pair Offspring
It is shown that EPO are larger, heavier, and more likely to fledge than their WP half-siblings in a population of blue tits, Cyanistes caeruleus, and suggested that the evidence for genetic benefits from extra-pair copulation may be less compelling than currently accepted. Expand
Pre-ovulation control of hatchling sex ratio in the Seychelles warbler
Pre–ovulation mechanisms may be the sole means of adjustment in the Seychelles warblers, as high fitness differentials between sons and daughters, may be necessary for primary sex ratio adjustment to evolve. Expand
Ultraviolet crown colouration affects contest outcomes among male blue tits, but only in the absence of prior encounters
The results suggest that structural-based UV colouration can affect the outcome of an interaction, but that size differences and the outcomes of initial interactions between opponents can override the influence of this signal in conflict resolution. Expand
Impacts of visitor number on Kangaroos housed in free-range exhibits.
There was no evidence of adverse effects animal welfare in these study groups based on avoidance behaviour or stress physiology under the range of visitor numbers that the authors studied and there were limitations in interpreting these results in terms of fear of visitors. Expand
Animal personality and pace-of-life syndromes: do fast-exploring fairy-wrens die young?
The pace-of-life syndrome (POLS) hypothesis for animal personality proposes that variation among individuals in life-history strategies is associated with consistent differences in behavior. WeExpand
The evolution of egg rejection by cuckoo hosts in Australia and Europe
It is suggested that parasitism is always sufficiently costly to select for host defenses and that the evolution of defenses may be limited by proximate constraints such as visibility within the nest. Expand
Estimating expenditure on male and female offspring in a sexually size-dimorphic bird: a comparison of different methods.
Comparisons of surrogate measures of parental investment in the brown songlark Cinclorhamphus cruralis reveal remarkable agreement between these estimates of investment and suggest that all may provide quantitatively useful information on sex allocation. Expand
Ultraviolet plumage does not signal social status in free-living blue tits; an experimental test
It is concluded that the UV reflectance of the blue tit's crown does not serve as a signal of status in competition over food in winter and it is suggested that enhancing attractiveness in mate choice may be the sole function of the crown'sUV reflectance. Expand