In 1852 the Brooklyn Institute released eight pairs of house sparrows to eat the caterpillars stripping the borough's shade trees, and topped the colony up with more birds from England the next year; the sparrows mostly ignored the caterpillars — they eat grain - ScienceBlog.com

In 1852 the Brooklyn Institute released eight pairs of house sparrows to eat the caterpillars stripping the borough's shade trees, and topped the colony up with more birds from England the next year; the sparrows mostly ignored the caterpillars — ...

In 1852 the Brooklyn Institute released eight pairs of house sparrows to eat the caterpillars stripping the borough's shade trees, and topped the colony up with more birds from England the next year; the sparrows mostly ignored the caterpillars — they eat grain  ScienceBlog.com