What key vocalization ability distinguishes the cougar lineage from the Panthera genus?

Answer

Produce purrs rather than true roars

Cougars belong to a lineage that evolved to produce purrs, separating them from the Panthera genus, which contains the big cats capable of true roars.

What key vocalization ability distinguishes the cougar lineage from the Panthera genus?
animalmammalclassificationÇatcougar