Oophaga

The poison dart frog is diurnal and terrestrial, like most frogs, and is shielded from predators by its aposematic coloring. This species exhibits physical violence between males and is quite territorial. This species has a strong sense of territoriality and will tenaciously protect its breeding grounds by making noise all night long.

These frogs use this tactic to save energy and prevent violent fights. The smaller frogs naturally retreat from their domain and seek out a larger individual since the bigger frog you are, the deeper your sound!
Although they are often kept as pets, captive breeding poison dart frogs is difficult. However, the strawberry poison dart frog is more common and simpler to produce.