Eerie

Eeries are ghostly dinosaurs that first appeared in Super Mario World. They can fly in either straight or wobbly lines and usually appear in packs, damaging Mario or Luigi on contact. Eeries are only encountered in Ghost Houses, and they appear in most of them. Like Boos, they can only be defeated with a Super Star. Eeries make another appearance in the Nintendo GameCube version of Yoshi's Cookie, where they appear as the fourth opponent in the game's VS. Mode if the player plays on the medium difficulty.

Super Mario World

 * Super Mario World Instruction Booklet: This is a dinosaur spook that roams the haunted house. It comes after you with its pale face and ohhhh, what a ghastly spook it is!
 * Mario Mania: As they sweep through Ghost Houses, Eeries can catch Mario off guard. He can't beat them but he can jump them or stop them with a Spin Jump.
 * Nintendo Power Issue #28: Eeries: These zombie-like Eeries fly in their sleep.

Super Mario World: Super Mario Advance 2

 * Denizens of Dinosaur Land poster: These ghastly spooks roam about the Haunted House. They're ghostly pale, and they chase after all interlopers. Creepy!

Nintendo Kōshiki Guidebook – Yoshi's Egg
★テレサウルス 恐竜の魂. 世に未練のある恐竜が寿命となったり惨殺されたりして死ぬと、このような霊体となって現われる. （丹波哲郎氏談うそ）.

★Eerie ''A dinosaur spirit. When a dinosaur with lingering regrets dies naturally or is slain, it appears as such a ghostly body. (Mr. Tetsurō Tamba's unbelievable claim).''

Perfect Edition of the Great Mario Character Encyclopedia
「テレサウルス 種族 ゴースト族 性格 のんびり屋さん 登場ゲーム ワールド」 おばけ屋敷にさまよう恐竜 おばけ屋敷で、テレサたちと一緒暮らしている、恐竜のおばけ. 集団で空中をさまよっているだけで、これといった攻撃はしてこない. とぼけた顔の恐竜おばけだ.

Eerie Species: Ghost Tribe Disposition: Easygoing person Appears in: World A dinosaur wandering in a haunted house ''A dinosaur ghost who lives with Boo and her friends in a haunted house. They only wander around in the air in groups and do not attack in any particular way. They are funny-looking dinosaur ghosts.''

Encyclopedia Super Mario Bros.
Bio: おばけ屋敷に出現する恐竜 のオバケ. 空中を横方向に浮遊してくる. ''A dinosaur spirit that appears in haunted houses. They float horizontally through the air.''

Trivia

 * Although Eeries are absent in Super Mario Advance 4: Super Mario Bros. 3, their graphics are present in the game's code, suggesting they were intended for a level in World-e.
 * The underbodies of Bonneters in Super Mario Odyssey resemble those of Eeries.