More than one edible frog in the pond just outside the hide.
Sometimes, frogs sat on the bank, watching their mirror image in the pond.
Then, they jumped back in the water again.
Kingfishers sometimes visit the pond, but not when we were there on 10 June. Maybe there is more chance of seeing a kingfisher earlier in the year, when the frogs are in the tadpole stage and are easier to catch.
On 10 June, we often saw bank voles drinking at the pond and running around.
This video says about itself:
30 May 2016
Postojna Cave (Postojnska jama) in Slovenia – In January 2016 an extraordinary event has happened. The female olm (Proteus anguinus) has started laying eggs in the aquarium of the cave in front of visitors. After four months 24 embryos are developing well and already “practicing their dragon dance“. This is a funny video of baby dragon embryos rotating in their jellies – a few steps from hatching. But their destiny is still uncertain so please keep your fingers crossed.
See also here.