A moonbow is a rainbow caused by moonlight. It’s a bit fainter than an actual rainbow. Moonbows are rare because moonlight is not very bright. A bright full moon is needed & it must be raining opposite the moon. The sky must be dark and the moon must be less than 42º high. (Source) (You may also like: 360 degree rainbows)
The Sumatran Tiger is said to be extinct by 2015, with fewer than 300-400 left in the wild due to large-scale habitat loss, poaching, hunting and human-tiger conflict. Other subspecies are said to follow.