They are a week or so later than they have been in recent years but they’re back in force: frogs, hundreds of them. The pond outside the Northumberland Wildlife Trust office fills at this time of year with large numbers of frogs, leaving behind large clumps of frog spawn. They started returning at the end of last week and have probably now reached peak numbers. The cold frosty start meant all was quiet this morning but by lunch time it was a mass of bodies all trying to pair up. Most of the frogs that make this a temporary spring home are relatively grey in colour with a strikingly pale, almost pale blue, throat. Occasionally an outsider can be seen, a ginger coloured one or most rare a greenish one. The gentle croaking seems to add a calmness to the proceedings though, of course, nothing could be further from the truth for the frogs themselves where it’s an unseemly scrabble for a mate and thus to the production of spawn.