While macroplastic pollution has been widely acknowledged & researched for more than 50 years, it has only recently become clear that microplastics are widely prevalent & hazardous. With the ability to penetrate all levels of an organism, these tiny fragments are suspected to have serious pathological effects when ingested by wildlife and humans. Combining biomedical techniques and conservation ecology, the MicroPOW research team aims to reveal the biological consequences of microplastic ingestion on wildlife’s organs, tissues and cells. They are focusing on two shearwater species of the Lord Howe Island (Australia), seabirds which are heavily exposed to plastic pollution: Flesh-footed shearwaters are compared to their Wedge-tailed relatives which are 10 times less contaminated. Since all vertebrates show very similar physiological responses, the results of this study will be reasonably relevant to humans.