My new found respect for the sea monkey

BBC - Earth - The animal that lives for 10,000 years

Perhaps that should be "lives" (in inverted commas) because what they are talking about is the larva cysts, which can dry out yet appear to be viable for 10,000 years.  (They know this because they got some to hatch from old salt layers of that age.)

Still, that is very impressive.  It sounds as if it won't be cockroaches that inherit the earth, after all.