MEGELLANIC CLOUD
"the small nearby galaxies that are being absorbed by the Milky Way. It appears that they were once small Barred Spiral galaxies, but because of their close proximity to the large Milky Way galaxy, they became distorted and lost much of their shape."

MILKY WAY AND ANDROMEDA
"It is predicted that in a few billion years the Milky Way galaxy will merge with the Andromeda galaxy. During the initial time of the collision the newly formed galaxy may look to be Irregular as their gravities pull each other apart and stretch the other like clay."