This save, including the autosaves, crashes on "loading units". As far as I know there were no forgotten beasts. I had less than 30 dwarves. It was year 51.

I was using 50.05 with the following mods: Audible Alerts, Claije's Seasonal Farming Extended, Creature Graphics Extended, Crows Fix, Detailed Landscapes, Dizzy's Dog Breeds, Golder Gold, Interface Tweaks, Let Dwarven Women Have Beards, Milkable Gorillas, Obvious Engravings, Reduced Z-Level Fog, Rounded Hills, See-Through Smoothing Designations w/ Priority, Specific Decoration, Squad & Burrow Icons, Work Detail Icons, Workshops without floors, [Vanilla] Deon's missing Plant Graphics replacement

Let me know if you need any other information!