"He also has small orange feet."
他还有橙色的小爪子should be more appropriate translation. In this case, we are talking about Duo has green feathers and also has orange feet. So this also should be 还有。It is implying that in addition to green feather, he also has orange feet. 也 is used as "also" for She has orange feet, he also has orange feet.
For animals, feet are not 脚， 爪子is more appropriate for these kinds of feet.