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Yep, looks clearly like environmental crime (again). Look no further...

New wave of predator and scavenger poisoning by small-stock farmers in Namibia and Botswana (2019):

Other animals and scavengers appear unaffected.

Researchers might want to look for calcium oxalate crystals in the urinary bladder.

The first thing I think of is that case of acacias killing antelope: https://jstor.org/stable/24997007

Maybe, but cyanobacteria are not an uncommon thing and kill animals all the time.