Occurrence of Bird species in Donga Basin between 1967 and 1999

Ornithological observations were made in and around the lowland tropical forest in the Donga River basin in the southern part of Taraba State (Kurmi Local Government), eastern Nigeria (10° 34' E - 10° 55' E and 6° 57'N - 7° 17'N). In the area where most of the field research was done, the forest has suffered considerable disturbance, but some of the more remote parts trekked through and worked in were in better shape. In terms of the proportion of land still covered by forest, Kurmi Local Government can probably compare favourably with any local government in Nigeria outside the major forest blocks in Cross River State.
The observations were made between 1967 and 1999 and a total of 849 observations of 306 species were recorded, with an additional 8 unconfirmed species. Some of the rare sightings were Grey-headed Broadbill (Smithornis sharpii), Red-capped Robin-Chat (Cossypha natalensis), Green-throated Sunbird (Nectarinia rubescens), Johanna's Sunbird (Nectarinia johannae), and Cameroon Indigobird (Vidua camerunensis), some of which were first sightings for Nigeria.

Data collection was carried out by Mark Hopkins, Newton Isaac, Herman Gray, Genesis Limtin, Bulus Jeremiah, Fidelis, Paul Ishaya, Robert Payne, Laura Payne, Phillip Hall, Nehemiah James, John Barker, Glenn Mitchell, S. A. Manu, Malik Abubakar, Modu Kolo, Mohammed Boyi, Harry Hamsom, Naphtali Enwongulu, Tim Palmer.

在塔拉巴州南部（库尔米地方政府）东部的东加河流域及其周边的低地热带森林中进行了鸟类观察。在大部分实地研究进行的区域内，森林遭受了相当程度的破坏，但部分较为偏远、经过踏勘并从事工作的区域状况相对较好。就森林覆盖土地的比例而言，库尔米地方政府或许可以与尼日利亚除克罗斯河州主要森林区块之外的其他地方政府相媲美。
观察记录始于1967年，截止于1999年，共记录了306个物种的849次观察，另加8个未确认物种。其中一些罕见的观测包括灰头犀鸟（Smithornis sharpii）、红冠鹟鸟（Cossypha natalensis）、绿喉蜂鸟（Nectarinia rubescens）、约翰娜蜂鸟（Nectarinia johannae）和喀麦隆黑鹟（Vidua camerunensis），其中一些是该物种在尼日利亚的首次发现。
数据收集工作由马克·霍普金斯、牛顿·艾萨克、赫尔曼·格雷、创世纪·林汀、布卢斯·耶利米亚、费德尔里斯、保罗·伊沙亚、罗伯特·佩恩、劳拉·佩恩、菲利普·霍尔、尼希米亚·詹姆斯、约翰·巴克尔、格伦·米切尔、S. A. 曼努、马利克·阿布巴卡尔、莫杜·科洛、穆罕默德·博伊、哈里·汉森、纳法塔利·恩翁古卢、蒂姆·帕尔默等人完成。