== 描写 ==
古王国時代<ref>紀元前2686年頃 - 紀元前2185年前後。エジプト第3~第6王朝にかけて。</ref>のピラミッド・テキストには、アトゥムのシンボルとして「bnw」が登場するが、これはベンヌの原型であった可能性がある。この言葉には鳥のヒエログリフが使われているが、それは間違いなくサギではなく、小さなさえずる鳥である。古い「エジプト語辞典」では、この小さなさえずる鳥をキセキレイではないかと推測しているが、明確な理由は記されていない<ref name="Hart"/>。。しかし、ベルリンのエーゲ海博物館に所蔵されている古王国時代第5王朝のニウッセルラー王の太陽神殿から出土した石灰岩の浮彫り壁片に描かれている「bn.t」という単語の綴りに使われている鳥は、この鳥の壁画の体の大部分に青灰色の絵具の痕跡がはっきりと見られ、キセキレイとは別の種類の鳥であることは間違いない。形や色からして、むしろカワセミ(Alcedo atthis)のようだが、この鳥には「hn.t<y'= lit. hn.t<y'=『運河のもの』」という別の名前が使われていた。。
However, the same bird used in the spelling of a word 'bn.t' in a painted limestone relief wall fragment from the suntemple of the Vth Dynasty king [[Nyuserre Ini|Niuserre]] from the Old Kingdom, now in the Aegypisches Museum at Berlin (inv.nr. Aeg.Mus. 20038-20039), clearly shows traces of blue-grey paint on much of the body of this bird-sign, so that a different bird species was definitely meant. Shape and colour seem to point rather to a (Mediterranean) [[Common kingfisher|Kingfisher]] (Alcedo atthis) for whom, however, another name was in use: 'hn.t<y'= lit. 'the one of the canal'. Traces of orange(brown)colouring existing on and also outside the chiseled glyph did originally not belong to this particular bird sign. They are caused by natural stains in the white limestone, as the higher lying layer of blue paint on the bird shows as well. The advantage of such bird identification might be, that a Kingfisher flying lowly over watery surfaces and shrieking loudly would be a reasonable mythical example for the creator deity Atum of Heliopolis as having risen from the first dark waters, called Nun, in order to start his creation of the world. If so, this Kingfisher 'bnw' or 'bn.t' is a good match for the mythical and cultic Nilegoose (Eg. 'smn')of the creator deity Amun in later periods, imagined to having been honking loudly in the primeval dark above the still waters in order to bring forth all creation by its voice.{{cn|date=March 2021}}
[[New Kingdom of Egypt|New Kingdom]] artwork shows Bennu as a huge [[grey heron]] with a long beak and a two-feathered crest. Sometimes Bennu is depicted as perched on a [[benben]] stone (representing Ra and the name of the top stone of a pyramid) or in a willow tree (representing Osiris). Because of the connection with Osiris, Bennu sometimes wears the [[Atef]] crown,<ref name="Wilkinson"/> instead of the solar disk.