Dr. Gregorio Moreno-Rueda (University of Granada, Spain) is an evolutionary ecologist with more than one hundred publications dealing with vertebrate ecology. He mainly studies the evolution of trade-offs determining life history traits, in particular how the immune system trades off with other physiological traits. Dr. Mar Comas (Dartmouth College, USA) is a herpetologist specialising in amphibian evolutionary ecology. Mar Comas works mainly on how amphibians deal with parasites and the trade-offs of these antiparasitic strategies with other physiological traits.