Ïã¸ÛÁùºÏ²Ê¹ÒÅÆ×ÊÁÏ

My country:
Pied avocet (Recurvirostra avocetta), one of the species included in the study. © Robert Blanken

Protected areas don’t always boost biodiversity

Protected areas such as national parks have a "mixed impact" on wildlife, according to the largest ever global study of their effects, published in the journal .