Big Al, often called "Al" for short, is a young male Allosaurus rescued from the Late Jurassic Wyoming. Saved as a mature, 7 year old adolescent, Al has since then grown up to be a fully grown male. He resides with his mate Alice in their enclosure.
Al has many different traits not seen in other Allosaurus. Much like Sue, he is tenacious, cunning, persistent, and rather intelligent, for an Allosaurus. Additionally, when he was first saved, Al was only a mature adolescent as opposed to a fully grown adult. Originally a 7-year-old adolescent that stood 13 ft. (4 m) tall, measured 30 ft. (9 m) long, and weighed 3 tons (6,000 lbs.), Al has since grown into true adulthood. Now around a decade old, he measures 38 ft. (11.8 m) long, stands 16 ft. (5 m) tall, and weighs up to 5 tons (10,000 lbs.). One of the largest terrestrial carnivores of the park, he is also capable of running at speeds as fast as 21 mph.