I enjoyed the AP story “No Strain for Andromeda: Galaxy Is Cosmic Cannibal” about M31’s savage treatment of dwarf galaxies unfortunate enough to cross its path. If you have access to Nature you can read the nitty gritty here; otherwise, I recommend a peek at the Pan-Andromeda Archaeological Survey’s images and a trip to Astropoetica’s archives to read Greg Beatty’s fabulous “One Man’s Cannibalism.“