By Susan Milius
Crossbreeding between the rare California tiger salamander and an invasive species has given the mixed offspring a surprising boost in survival, say geneticists.
Though the lineages of barred tiger salamanders and the California tigers split some 5 million years ago, the species crossbreed in the Salinas Valley, according to Benjamin M. Fitzpatrick of the University of Tennessee in Knoxville. Fish-bait entrepreneurs imported young barred salamanders from Texas about 60 years ago.