The frog may be using its bright blue foot as a visual signal to communicate with other frogs. Since the frog lives near a loud waterfall, it is possible that sound communication may not be effective. Therefore, the frog may use visual signals, such as its bright blue foot, to communicate with other frogs in the area. This could be a way to attract mates or signal to other frogs about the location of resources, such as food or shelter. Alternatively, the frog may be using its bright blue foot as a way to warn potential predators of its toxic nature, as bright colors can often be associated with warning signals in the animal kingdom.
~~~Harsha~~~