I’ve just arrived in Limon, a port town on the Caribbean coast of Costa Rica, to track the spread of the introduced species A. cristatellus. Several realizations occurred to me as we wended our way down the mostly beautiful road from San Jose. First, I realized that not only have I seen cristatellus in its native range of Puerto Rico and the Virgin Islands, but I’ve also seen introduced populations in Miami and the Dominican Republic, as well as here. This species gets around!