Fewer Low Throaty Grunts

Northern leopard frog populations have been declining for about 30 years across their western range. The Calgary Zoo is studying this, in co-operation with the University of Calgary.

The fact sheet on the linked page (which is deep within the Calgary Zoo website) contains good info. This is real science and meaningful research aimed at understanding a loss of species that goes beyond the Northern leopard frog and its low throaty grunts.