What is a group of pegasi (more than one pegasus) called?

I've never heard of a group of the winged mythical horse.

However, here is the plural, "In modern terminology, the word "pegasus" (plural "pegasi") has come to refer to any winged horse, though the term "pterippus" (meaning winged horse, plural "pterippi") is also used.".

Perhaps a group could be called a constellation? (see below)

https://en.wikipedia.org/wiki/Pegasus_%28constellation%29

https://en.wikipedia.org/wiki/Pegasus

If you should happen to want to use Pegasus in the plural (you shouldn't. By now you should have caught on to the distinction between Pegasus and pterippus), you can use pegasi. Every time I hear it, I think of a fantasy story where the Greek gods have invented cloning... "Look Zeus! Pegasi! Pegasi for all!"

http://everything2.com/title/PEGASUS

These people bring up a good point: There was only one Pegasus so a plural is impossible.

A Herd -- ...and the men of Fantasia set off on a Pegasus herd for the Gir Forest of India where the albino lion still puts terror in the hearts of all animals.

[from 2016 answers.yahoo article, no longer online]

From a linguistic point of view, as the original Greek is Πήγασος (Pégasos), the plural ought to be Pégasoi...
http://www.telusplanet.net/public/alfvaen/latin.html