Ornithologist Wulf Gatter spent six days a week observing birds in the forest of Liberia, the West African country. He spotted one seen nowhere else, a medium-sized yellow songbird, on nine occasions during the county's annual dry season lasting from November to February. It looked quite similar to another species, but had never-before-seen white markings on its wings. He finally captured a specimen towards the end of his visit in 1984 -- it seemed like he'd found a whole new species, which he named Phyllastrephus leucolepis, the Liberian Greenbul.