Moon Butterfly

HUD description before collecting: Eclipse Butterfly (Rare Butterfly; 100 Bear Points): It's the rare Eclipse Butterfly. Don't look directly at it.+1 Trophy

menu description after collecting: Moon Butterfly: Somewhat rare butterfly here.

The Moon Butterfly (confusingly mislabeled in the HUD as the Eclipse Butterfly before it has been collected) is a Den Trophy, and one of the four butterflies needed to win the achievement Rare Butterfly.

Location
The Moon Butterfly is on Top o' the Mountain in Calypso Mountains.

When, you'll get there, there will be a stone wall (which is part of the Bear Temple, it's also there). Behind the wall there will be a beetle, and to the right of the beetle, just on the cliff, there will be a Moon Butterfly.