This 30 June 2015 video from the Hoge Veluwe national park in the Netherlands is by Ruben Smit, maker of the Dutch wildlife film De nieuwe wildernis.
It shows a female moor frog, going to look for a (blueish) male to mate with after her hibernation.
Pingback: Mating moor frogs, video | Gaia Gazette
Pingback: Moor frogs’ mating season | Dear Kitty. Some blog