We live in a highly populated suburb of Boston. Our home is on top of a
hill about 1/2 mile from a tiny stream running at the base of the hill.

We built a small pond about 3x3 foot and 9 inches deep. Each year we
find a few green frogs appearing and are mystified that they can find
us. Do the adults just wander about seeking water to deposit eggs? Can
they sense water 1/2 mile away?

Can someone offer an explanation?

Thanks....