This video is called Glow worm(s) (Lampyris noctiluca) part 3. Southern Finland.
From Wildlife Extra:
Where to see Glow worms in the UK
Female glow-worms produce a soft light in their tails during early summer nights to attract males.
But the romance is a rushed one – adult beetles survive for just a few weeks and in that time they need to mate and lay eggs to ensure the survival of the next generation.
Once far more widespread than they are today, glow-worms have cast a spell over humans for centuries. Shakespeare mentions them in Hamlet and their soft glow on mid-summer nights must have seemed like a scene from a magical world.
Where & when to see glow worms in the UK
Glow worms are nature’s nightlights and are at their best in July. Some of the UK’s best spots to see them are:
Ilam Park in Derbyshire
Cotswold Water Park
Chambers Farm Wood Nature Reserve in Lincolnshire
Arnside Knott in Cumbria
Fireflies in the USA: here.
14 fun facts about fireflies: here.
MEDFORD/SOMERVILLE, Mass. (June 25, 2012) – The twinkling of fireflies heralds summer romance for these magical insects. While courting on-the-wing, male fireflies attract females’ attention with bioluminescent flashes: here.
the fireflies here are very small, how big are glow worms?
There are various species which differ in size.
Wikipedia says about the species in the video and in the Wildlife Extra story:
“females are larviforme, wings are missing and they are often twice the size of the males (up to 25 millimetres or 1 inch in length”.
http://en.wikipedia.org/wiki/Lampyris_noctiluca
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