A colony being tracked by University of Washington professor P. Dee Boersma, about 1,600 km (1,000 miles) south of Buenos Aires, has fallen by more than 20 percent in the past 22 years, leaving 200,000 breeding pairs. Some younger penguins are now moving their breeding colonies north to be closer to fish, but, in some cases, this is putting them on private, unprotected lands. As a result of these changes, some penguins are known to have been lost or confused.[18] At present, 12 of 17 penguin species are experiencing rapid population declines.