**加斯顿鸟**（學名*Gastornis*），又名**冠恐鸟**或**戈氏鳥**，是一屬已滅絕及不懂飛行的大型鳥類，生存於古新世晚期至始新世。

加斯顿鸟的學名是以其發現者賈斯頓·普蘭特（Gaston Planté）來命名，其首個化石於1855年在德國的蓋塞特發現。於1876年，愛德華·德林克·科普（Edward Drinker Cope）在北美洲發現另一組化石，並取名為不飛鳥（學名*Diatryma*）。牠們是極接近的近親，學者現時相信牠們是屬於同一類。

描述及生態
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加斯顿鸟属下的*G. parisiensis*平均身長有1.75米，而*G. edwardsi*則有2米高。加斯顿鸟的喙特別大及呈鈎狀，腿大而強壯，腳掌大且有爪，推測牠有可能是草食性的，但目前仍有爭議。

加斯顿鸟生存的環境有大量的密林，氣候潮濕至半乾旱。北美洲及歐洲當時很接近，尤其格陵蘭是被林地及草原覆蓋，這兩個洲之間只有約幾百公里闊的海峽阻隔加斯顿鸟的祖先。當西部內陸海道退卻後，北美洲就成為一個連接的大陸，歐洲因為阿爾卑斯造山幕及古新世-始新世極熱事件的高海平面而成為群島，地理上有點像今天的印尼。

過往不飛鳥被指為掠食者，就加斯顿鸟雙腳的大小，牠可能較為靈活，以追捕快速的獵物。故此，加斯顿鸟被指是隱藏自己，或是群體狩獵獵物。如果加斯顿鸟是掠食者，牠需要利用其他手法在密林中獵食。

另外有指加斯顿鸟有可能是吃腐肉、雜食性或草食性的。但是加斯顿鸟的喙很適合用來咬碎種子及撕開植物。不過其鳥喙有可能是社交性的，而非性徵。這些互相矛盾的假說，使得對加斯顿鸟的食性更不清楚。

類似加斯顿鸟的新生代巨大鳥類有南美洲的駭鳥及澳洲的馳鳥科。前者是肉食性的，而後者懷疑是掠食者。另一方面，鴕鳥亦是不能飛的大鳥，是以植物及無脊椎動物為食物。

加斯顿鸟是古新世中最大的鳥類之一。牠們有一些天敵及競爭者，例如歐洲像熊的*Arctocyon*。如果這些巨大的鳥類是主動的獵食者，牠們會是始新世中期北美洲及歐洲生態的頂尖掠食者。始新世中期在歐亞大陸及北美洲出現了肉齒目及中獸類，且與加斯顿鸟數量下降的時間相吻合。這有可能是哺乳動物趨向於群體獵食。由於沒有鳥類重過半噸，牠們的演化成更大體型的能力亦受到限制，未能像哺乳動物般演化出更大量的頂尖掠食者。

參考
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* Cope, Edward Drinker.. Proc. Acad. Nat. Sc. Philadelphia. 1876: 10–11.
* Hébert, E.. C. R. Acad. Sci. Paris. 1855, **40**: 579–582 （法语）.

外部連結
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* BBC Science and Nature Archive.is的存檔，存档日期2012-12-23
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| 遠洋鳥科 | 
* Aequornis（英语：）
* 卡斯皮齒翼鳥屬（英语：）
* 曲鳥屬（英语：）
* 森林鳥屬（英语：）
* 巨齒鳥屬（英语：）
* 岩鳥屬（英语：）?
* 巨齒翼鳥屬（英语：）
* 馬努鳥屬（英语：）?
* 齒翼鳥屬
* 意外"緣齒鳥"（英语：）
* 骨齒鳥屬
* 擬古鵝屬（英语：）
* 遠洋鳥屬
* Proceriavis（英语：）?
* 原齒翼鳥屬（英语：）
* 原鵜鶘屬（英语：）?
* 擬齒鳥屬（英语：）
* 鼓島鳥屬（英语：）
* 盧特齒翼鳥屬（英语：）

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* Omorhamphus（英语：）
* 中原鳥屬

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* 馳鳥屬
* 巴拉沃地鳥屬（英语：）
* 牛鳥屬
* 伊班地鸟属（英语：）
* 巨鳥屬

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| 維加鳥科 | 
* 南鳥屬?
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* 新潛鳥屬（英语：）?
* 極地鳥屬
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* †奧斯汀鳥屬
* **†馳鳥科（英语：）?**

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| †擬雞科 | 
* 擬雞屬
* 似副鶉屬（英语：）

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* 火鹑属（英语：）
* 斯科派洛鹑属（英语：）
* 副鶉屬（英语：）
* 花剌子模鶉屬（英语：）

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| †凯尔西塚雉科 | 
* 陶巴秧鸡属
* Ameripodius（英语：）
* 凯尔西塚雉属

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| †森鸡科 | 
* 斐济巨鸡属
* 森雞屬

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 | Dromornis stirtoni
Sylviornis neocaledoniae |

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* 另見:
* 家禽
* 分类 Category

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| 分類單元識別碼 | 
* 维基数据: Q131477
* 維基物種: Gastornis
* Fossilworks: 39557
* GBIF: 4847508
* IRMNG: 1267730

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