"Calling All Females!"
This male Bull Frog (Rana catesbeiana) knows what time of year it is...mating season. He has a green upper lip and a large yellow vocal sac that inflates when he vocalizes. It's fully expanded in the picture above. The water vibrates with his loud, deep-voiced "Rhummm" and ripples in the water radiate away from him in concentric circles. There were numerous males along the water's edge, spaced about 15-20 feet apart, and when they vocalized at the same time, it made for a very eerie sound.
Seen at Lake St. Clair Metropark (Metro Beach), Harrison Township, Michigan, USA.
EXPLORE #344 on MAY 18, 2012
"Calling All Females!"
This male Bull Frog (Rana catesbeiana) knows what time of year it is...mating season. He has a green upper lip and a large yellow vocal sac that inflates when he vocalizes. It's fully expanded in the picture above. The water vibrates with his loud, deep-voiced "Rhummm" and ripples in the water radiate away from him in concentric circles. There were numerous males along the water's edge, spaced about 15-20 feet apart, and when they vocalized at the same time, it made for a very eerie sound.
Seen at Lake St. Clair Metropark (Metro Beach), Harrison Township, Michigan, USA.
EXPLORE #344 on MAY 18, 2012