Sperm exhibit extraordinary levels of morphological diversification across the animal
kingdom. In songbirds, sperm have a helically shaped head incorporating a distinct …

Sperm swimming performance affects male fertilization success, particularly in species with
high sperm competition. Understanding how sperm morphology impacts swimming …

Sperm cells are variable both within and among species. To be able to accurately measure
sperm cells and understand their function, it is important that sperm cells are preserved in a …

Theoretical models predict that investment in pre‐copulatory and post‐copulatory sexually
selected traits should trade‐off. At the macroevolutionary scale, the majority of studies to …

Sperm morphology is highly diversified among species and at higher taxonomic levels. In
birds, there is also increasing evidence of geographical differentiation in sperm traits within …

Reproductive isolation is central to the speciation process. Recent research suggests that
where heterospecific mating occurs, postmating prezygotic (PMPZ) barriers and hybrid …

When sperm from multiple males compete for fertilisations after mating (ie sperm
competition), selection is expected to favour traits that allow males to outperform rivals and …

Sperm fixation in better conditions is a requisite for the examination of sperm morphology
using optical microscopes. Few studies, however, have yet explored the optimal sperm …