Poison Dart Frog Black/ Green

My animal is the Poison Dart Frog. I think in the future poison dart frogs are going to have tails, and gills just like when they are tadpoles, but they will still have legs but only 2. I think they are going to live in oceans due to the polluted air. They will still have bright spots on their skin to warn other animals to not eat it, and they will still use their deadly poison to hunt for prey that are small animals like shrimp, algae, plankton, and other small fish. To hunt they use their excellent sense of vision, and then when it sees an animal it waits for it to get close to it then it strikes, as fast as lightning and injects the poison into the prey, and before the prey knows he or she will be food to the frog.