SciencefromNature1 day agoChasing crayfish and the leeches that live on themBranchiobdellidan leeches on crayfish clean hosts at low numbers, become mildly parasitic in large colonies, and serve as bioindicators of crayfish and river health.
World newsfromwww.dw.com6 months agoHow climate change is altering bird migration DW 05/09/2025Migratory birds are crucial for ecosystem health and food security, acting as bioindicators and migrating thousands of kilometers for survival.