The baritone call of the bullfrog is so deep and resonant ... The largest of all North American frogs, this giant can grow to a length of 8 inches or more and weigh up to 1.5 pounds.

However, the weird and upsetting sound made by the bullfrog in this video from Mark ... The bullfrogs captured in the video above are most likely American bullfrogs (Lithobates catesbeianus).