What's a tarsier raven? I can't find anything describing that common name; I get back results about tarsiers and results about ravens, but nothing that combines

What's a tarsier raven? I can't find anything describing that common name; I get back results about tarsiers and results about ravens, but nothing that combines the two. I wouldn't necessarily expect it to be in any of my bird books, which mostly only cover North America, but it's a surprise for Google to likewise come up empty.