Fink, L.S. 1984. Venom spitting by the green lynx spider, Peucetia viridans . Fink, L.S., Brower, L.P., Waide, R.B. and Spitzer, P.R. 1983. Overwintering monarch butterflies as food for insectivorous birds in Mexico. Fink, L.S. and Brower, L.P. 1981.
Birds can overcome the cardenolide defense of monarch butterflies in Mexico.