Niue 2025 $1 Australia At Night Bottlenose Dolphin 1oz Silver Black Proof CoinBottlenose dolphins can be found in warm waters across the planet, from the shallow coastal waters and rivers, through to the deep ocean. Thought to be one of the smartest animals on the planet, Bottlenose Dolphins use a sonar system called echolocation to navigate, communicate, hunt, and avoid predators in dark or murky waters. Distinguished by a dramatic Black Proof finish, this coin forms a fascinating exploration of Australia at Night.