Sydney was battered with heat and humidity this week, and while us humans experience dehydration and exhaustion, heatwaves are having more surprising effects on our birdlife.

A new study by Macquarie University has found that hot weather significantly reduces sperm quality in zebra finches, threatening the future of the species.

The study’s co-author, Lori Hurley, joined Jess to discuss the next steps in preserving these beautiful, balmy birds.