The Catumbo Lightning occurs on 140 to 160 nights a year, 10 hours per night and up to 280 times per hour.
Dirty thunderstorms, also known as volcanic lightning, occur when lightning is produced in a volcanic plume.
The eastern North American population is notable for its southward late summer/autumn migration from the USA and Canada to Mexico, covering thousands of kilometers. No individual makes the entire round trip. Female monarchs lay eggs for the next generation during these migrations.