The study led by Irv Kornfield, a professor of zoology at the University of Maine, may help solve that puzzle by providing answers that are based on science.
Ana Valenzuela Zapata, for years a professor of botany and zoology at the University of Guadalajara, has been studying the agave species for over two decades.
James Nagler, a University of Idaho assistant professor of zoology who led the study, said the results of the genetic testing on the natural-spawning chinook came as a surprise.