Frogs spawning

There seem to be more frogs than ever spawning in the moat. Given the predators that await the tadpoles it is pleasing to see that numbers of adults returning to spawn seem to be increased this year. The increase if depth of water in the moat has meant that one of the two sites where the frogs spawn is now just an area of water whereas the other is shallower and amongst reeds. In the former the spawning takes place under water and the spawn is resting on the bottom whereas in the reedy area it is all at the surface (pictured). It seems as if the frogs are programmed to return to the areas they spawn in rather than the particular conditions pertaining.