Hugh Jampton wrote:

Clearing the pond today and noticed quite a few tadpoles there. Didn't
think they should be there at this time of year. Should they ?

TIA.

AFAIK unusual but does happen. In order to metamorphose, tadpoles
require several essential nutrients in their food - if they don't get
the diet they need, they don't metamorphose. I think the commonest cause
is lack of iodine but undoubtably there are other causes.

Larry