Cougars took the lead in this study that was performed in Montana as the most impactful species on elk calves.

Eacker, D.R. et al. (2016) ‘Annual Elk calf survival in a multiple carnivore system’, The Journal of Wildlife Management, 80(8), pp. 1345–1359. doi:10.1002/jwmg.21133.

Music from #Uppbeat (free for Creators!):
https://uppbeat.io/t/paul-yudin/your-adrenaline
License code: QWS1TG5BYTFK2PCL