a little from German history:
one king of prussia (Preussen) had set out a head premium on sparrows becasue they were so many .. and the people have killed many .. sonn the king had must this premium take back: the insects increase so much on the corn fields.....so this this little sparrow has a important function .....lets estimate this kind of animal God use in Bibel to declaire HIS mighty and our worthyness :"NOT ONE OF THEM FALL ON THE GROUND W I T H O U T YOUR FATHERS WILL:"