"Species X" is to Covid19 as "Civet Cat" is to SARS.<p>Giving something a short well-known name makes it easier to talk about it.<p>We could have headlines like:<p>"Scientists still searching for Species X"<p>or:<p>"Species X: Bat, pangolin, mink, or something else?"<p>or, if you like conspiracy theories:<p>"There is no Species X"