black eggs?

black eggs?

Observation - black eggs? - UK and Ireland. Description: EDIT - added new pic taken 10 days after the first, new one shows the 'black eggs' have taken on water somehow (possibly from rain) and now appear more like what I'd expect frog spawn to be. As these are on the top of a fallen log, they haven't been in th

EDIT - added new pic taken 10 days after the first, new one shows the 'black eggs' have taken on water somehow (possibly from rain) and now appear more like what I'd expect frog spawn to be. As these are on the top of a fallen log, they haven't been in the pool 15m away.

cluster of small egg like balls on the exposed top side of a fallen log. any ideas? for scale, each 'egg' is around the diameter of a pencil lead.