Sullivan, Tim. "Dinosaur on a Bicycle"
Divergence: c 65,000,000 BCE
What if: The dinosaurs did not die out.
Summary: Saurian time-travelers to the past encounter travelers from futures in which various species dominate. Chaos ensues.
Published: In Isaac Asimov's Science Fiction Magazine, May 1987; and Dinosaurs! (eds. Jack Dann and Gardner Dozois), Ace 1990 (0441148832).
Original in: English.
Translation: Portuguese by Fábio Fernandes as "Dinossauro de Bicicleta", in Dinossauros! (eds. Jack Dann and Gardner Dozois), Zenith 1993.