Migrating Frogs?

[pat]

Have noticed that on the nights of 21 June frogs appear by the hundreds on the roads, all determined they are going somewhere - they seem to have a death wish jumping into the path of vehicles, if you watch as you drive along you will see all the light patches where they have been squashed.
You will see frogs leaping around on other nights but the night of 21st June they seem to be out celebrating the shortest night or longest day.
Would really like to know the reason as the frogs seem to do this in different parts of the country all on the same night.

[Kenn]

We need folk out with buckets, signs up or a frog underpass I'm thinking.