One of New Zealand big five species to see (think African safari checklist, but for flightless birds in New Zealand) is the kakapo. These parrots can live up to 95 years (maybe longer) and is very close to extinction.
So tape worms were found within a pair of captive kakapos, conservation biologist dewormed them.
Which may have been a mistake. Hamish G. Spenc
“Some of these parasites may turn out to be quite good for their hosts” – Hamish G. Spencer
Want to find out why? Check out the article over at the New York times!