SUMMARY: On a mammal-watching trip to Belize in December 2021 (15 nights) I saw +40 species of mammals. Mammal highlights included Baird’s Tapir, Hatt’s Vesper Rat (a Yucatan endemic) and Thomas’s Sac-winged Bat. Reptile records included Creaser’s Mud Turtle at La Milpa (NW Belize); this appears to be the first record outside Mexico. I travelled with Chi Phan.