Passage: The smallest dinosaur known is the bee hummingbird, with a length of only 5 cm (2.0 in) and mass of around 1.8 g (0.063 oz). The smallest known non-avialan dinosaurs were about the size of pigeons and were those theropods most closely related to birds. For example, Anchiornis huxleyi is currently the smallest non-avialan dinosaur described from an adult specimen, with an estimated weight of 110 grams and a total skeletal length of 34 cm (1.12 ft). The smallest herbivorous non-avialan dinosaurs included Microceratus and Wannanosaurus, at about 60 cm (2.0 ft) long each.

Question: How large were the smallest avialan dinosaurs?
60 cm (2.0 ft) long