What is the evidence that "Ospreys" are the birds in the first poem in the Shijing? Legge used &quot;Ospreys&quot; to name the first poem in the Shijing.  Karlgren often cites it that way, but his own translation leaves it as &quot;ts'u - kiu  bird.&quot; (Book of Odes, Museum of Far Eastern Antiquities, 1950).  
Apparently  Zheng Qiao (1104--1162) said the birds were Mallard Ducks, which makes sense though I have not seen the source. Zhu Xi agreed with this, see his commentary on the Shijing, paragraph 2 of this.
According to this, a somewhat obscure line of the Mao commentary was taken to mean the birds are some kind of hawk (like Ospreys), while Lu Ji 陸機 (261–303) believed the birds were Cormorants, while Guo Pu (郭璞; AD 276–324) believed they were fish hawks (such as Ospreys).
Have a look here
This interested me too a while back.
“分析风头鸊鷉的资料感觉，雎鸠是风头鸊鷉的可能性大些。”
关关雎鸠 should be 关关风头鸊鷉???