Some of the text information presented here was gleaned from Kawaldie's site: https://sites.google.com/site/kawaldie/ I also had a conversation with her to make sure I had a firm grasp of which subspecies were which. Coracopsis Vasa Vasa / Greater Eastern Vasa Size: 20 inches in length Wingspan: 22-25 inches Eyering color: grey/black Beak color: pale to dark depending on time of year Body color: dark The underside of the wings and tail of this subspecies are mostly black, with a bit of grey This subspecies is from Eastern Madagascar Coracopsis Vasa Drouhardi / Greater Western Vasa Size: 18 inches in length Wingspan: 20-23 inches Eyering color: white/bluish/yellow Beak color: pale to dark depending on time of year Body color: lighter than v. vasa The underside of the wings and tail of this subspecies are very grey/silver This subspecies is from Western Madagascar Coracopsis Vasa Comorenis / Comoro Vasa Size: 18 inches in length Wingspan: 20-21 inches Eyering color: white/yellow Body color: lighter than v. drouhardi The underside of the wings and tail of this subspecies are mostly brown, with a bit of grey This subspecies is from the Comoro Islands The v. drouhardi is the most common in the pet trade and seems to be the most prevalent subspecies in the U.S. and Canada. The v. comoro is the least common in the pet trade, but seems to be prevalent in Japan. The v. vasa is in the middle as far as commonality in the pet trade and there may be a few (but just a few) all over. There is a considerable amount of confusion when it comes to the three subspecies of greater vasa and the v. comorenis is even mistaken for a lesser vasa a lot of the time. The trick to telling the difference between these subspecies is: eyerings. V. vasa has grey/black eyerings. The color does not change and this is the only vasa subspecies with eyerings this color. V. drouhardi has an extended eyering. (a "tail" on the outer side) V. comorenis has a circular eyering. And to end this post, here is an example of all three subspecies of vasa: Left to right: V. vasa - V. drouhardi - V. comorenis Edit: Lesser vasas are not really mentioned in this post because they are a different species.