"We used data on the sex ratio of progeny of female #kakapo that had or had not received supplementary food, to test the hypothesis that supplementary feeding might cause a male-biased offspring sex ratio. There was a significant excess of males in the clutches of females provided with supplementary food."
Old paper but new to me.
Wonder how it has been adressed.
https://www.sciencedirect.com/science/article/abs/pii/S0006320701002671