tetrapods

In Most Tetrapods The Fourth Finger Is The First to Develop in The Embryo
Jan 8, 2014
In most tetrapods (land vertebrates) the fourth (ring) finger is the first to develop in the embryo. And in birds, the finger on the outside of the hand (posterior, the pinky side) appears first, which suggests that this is the ring finger. ...

Tags: tetrapods, birds, finger, embryonic finger, ring finger, evolution