Dragons,Ungoliant, Ents , Eagles and Huan

[Amarie of the Vanyar]

Tolkien said something about the nature of some of those 'creatures' [img]smilies/wink.gif[/img]

Living things in Aman. As the Valar would robe themselves like the Children, many of the Maiar robed themselves like other lesser living things, as trees, flowers, beasts (Huan)
Myths Transformed, VIII note 4; HoME 10

Huan and Sorontar could be Maiar - emissaries of Manwë. But unfortunately in The Lord of the Rings Gwaehir and Landroval are said to be descendants of Sorontar
Myths Transformed, VIII; HoME 10

From this I understand that Huan was a Maia, but the Great Eagles weren't because Maia cannot reproduce themselves. Therefore, neither Ungoliant nor the Ents could be Maiar, for the same reason. I don't know how to classify them, either [img]smilies/frown.gif[/img]