Two “species” of termites that have supposedly “evolved separately for thousands of years” have now been found to have hybridized and produced vigorous offspring! The males of one “species” even prefer females of the other “species”!

(Just heard about this tonight on CBC’s As It Happens.)
Question: If they can produce viable offspring, and if males show the “wrong” preference . . . then why are we calling them distinct “species”? They would appear not to fit the Biological Species Concept. Just like the various Galápagos Finch species have a problem fitting that Concept. See my article about those finches.
On the termites:
University of Florida writeup
PLOS ONE article (technical)
Richard Peachey