dried american bullfrog skin on display for educational purposes

american amphibian amphibians black breathe breathing bull bullfrogs captivity croak croaking cuisine cuisines dark darkened darker display dried dry educate education educational endanger endangered food frog frogs green greenish hunted hunter hunters invasive lab laboratories laboratory light lighter meat opportunistic pet pets plastic poach poaching predator predators purpose purposes reptile reptiles shade shades skin source sources species specimen specimens tank tanks toad toads translucent transparent