Each of five pigeons was trained on two conditional position discriminations. The two training discriminations had an element in common, either a stimulus or a response item. Following training on the two discriminations the birds were tested on a discrimination comprised of the elements of the other two discriminations with the common item omitted. Prior research with humans has shown that humans can perform with a high degree of accuracy on a third, untrained discrimination in similar situations (Sidman, Cresson, & Willson-Morris, 1974). Pigeons performed accurately on the third discrimination when they were trained with the two discriminations chained together, i.e., the common element falling in between the stimulus and response items in the test discrimination. In addition, these pigeons apparently used an overt mediating strategy. Other pigeons trained on other paradigms did not perform accurately on the test discrimination. In the latter cases the birds would have had to form backward associations in order to perform the test discrimination.