Today's Dino a Day T-shirt features T.rex on a bicycle with the moon in the background, a riff on the iconic scene from E.T. Naturally, T.rex is not using the handlebars. T-shirt is from zazzle.com.
Alas, it doesn't seem that bats evolved until after the Cretaceous, but appeared not long after.
A Dino a Day Strikes Back Previous Days
Day 1: Palmer Events Center (Austin Marathon Expo)
Day 2: Texas Memorial Museum
Day 3: Waller Creek Boat House
Day 4: Hartmann Prehistoric Garden
Day 5: UT Alumni Center
Day 6: O. Henry House and Museum
Day 7: Santa Rita Rig No. 1
Day 8: Texas Memorial Museum (Piranhas)