Is there actually any biologic mechanism to generat and conduct electricity at a high enough voltage and current that it can ionize air over a distance as large as that (looks like at least 1/2m) without damaging the actual animal doing it?
Looking around, electric eels can do 860V, which is well short from the 15kV needed to gap 0.5m of air at sea level, plus that animal's skin would need to be crazy insulating for all that power to not just go down the most highly conductive way possible (all the nice conductive water all the way down to the ground contained in the animal itself) instead of having to ionize 0.5m or air.
I mean, we can always claim it was possible but lost, but then again we can also claim that for magic or animal teleportation.