Pop up frogs

A poor photo I know but it had to be done.  The pond is currently very busy with amorous amphibians and in the living room, from behind the window, I can see the surface heaving with activity.

However, as soon as I go outside these heads rapidly disappear and I haven't been patient enough to wait for them to pop up again.

This was taken with my super zoom lens from the house.  I'll endeavour to do better this weekend but the pond might be chock-a-block full with frogspawn by then and the frogs may have moved on.