Spanish Sparrow (Passer hispaniolensis) is found in the Mediterranean region and southwest and central Asia. It is very similar to the House Sparrow, and the two species show their close association in a “biological mix-up“ of hybridisation in the Mediterranean region, which complicates the taxonomy of this species. The Sparrow Sparrow is about 15–16 cm (5.9–6.3 in) in length, and 22–36 g (0.8–1.3 oz) in weight. It is slightly larger and heavier than the House Sparrow, and also has a slightly longer and stouter bill. The Spanish Sparrow is gregarious, flocking and breeding in groups. In the winter, it mostly wanders nomadically or makes regular migrations. Like other sparrows, it feeds principally on the seeds of grains and other grasses, also eating leaves, fruits, and other plant materials. Young birds feed mostly on insects, and adults also feed on insects and other animals during and before the breeding season.