Butterflies each year flutter to the same spot on the earth,
Swallows come to Capistrano on the same day every year,
Geese return to the ponds where, as chicks, they once were reared,
Pigeons can find their homes from many hundreds miles away,
What helps their navigation? How they do it, who can say?
Do they use the earth's magnetics? Have they learned to map the sky?
Do they monitor sea currents? Do they land features espy?
Nature holds so many wonders, there's so much to learn still -
Surely brain-size does not matter, neither does the conscious will...