The ancestors of ostriches and emus were long-distance fliers. Here's how we worked this out

Aside from being a delight to watch, flight in birds is regarded by many cultures as a symbol of freedom, and a source of ...
eLife

Adaptations in wing morphology rather than wingbeat kinematics enable flight in small hoverfly species

Small hoverflies compensate for size-related flight challenges through evolutionary changes in wing shape rather than altered wingbeat kinematics.