Make some noise this Valentine's Day. ⁣ ⁣ Both male and female lions roar to signal territoriality or to call other members of the pride. A square-shaped larynx helps lions project their reverberating roars, and the sound can be heard several kilometres away. Rival prides will gauge how many other lions are in the vicinity as well as their proximity by listening to the volume and frequency of the calls. ⁣ ⁣ This Valentine's Day, eat your heart-shaped chocolates on the couch while watching a heap