I stumbled upon this video.
Source: https://www.facebook.com/reel/1418652579859120

Can you guys tell me if those are birds flying in and out of the lava?

I'm no video specialist but I like to play around with Lightworks. I slowed the video down to 15% speed and gave it a negative effect. I can make out wings flapping or what I think is wings flapping but there is some stuff that is beyond me.

At :08 there appears something like a bird shape but it was there for 2/100th of a second on Lightworks. Then at 2:40 something jets from mid left to upper right and seems to punch through the lava. Lastly I spotted this perfect triangle shape in the lava. Hopefully my clips and pictures make sense.

If looking on the original fb video, the possible bird is at :02 and the jetting object at :25.