Ha that's a wonderful observation - I think the subject is better discussed on an evolutionary biology forum or some such place - even more incredible to my mind is the ability of birds to travel half way round the world to the same lake - or even more incredible is frogs returning to the pond from which they spawned in order to mate - I'd say breadcrumbs but a few years ago the garden at my old house was completely remodelled - new fences put up and a gate installed at the back of the garden.
Next year I was outside and I noticed frogs hopping in from under the gate to get to the pond - a path that was previously completely blocked off by the topography of the garden - did they breadcrumb to the general vicinity and then left-right until they found a gap? did those frogs just happen to come from that direction and get lucky?
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