スズメ
Hybridisation between the Eurasian tree sparrow and the house sparrow has been recorded in many parts of the world with male hybrids tending to resemble the Eurasian tree sparrow while females have more similarities with the house sparrow. A breeding population in the Eastern Ghats of India, said to be introduced, may also hybridise with house sparrows. On at least one occasion a mixed pair has resulted in fertile young. A wild hybridisation with the resident sparrows of Malta, which are intermediate between the Spanish sparrow ("P. hispaniolensis") and Italian sparrows ("P. italiae"), was recorded in Malta in 1975.