Abstract A phenomenon of Anax ephippiger (Burmeister, 1839) aggregation on the coast for the Strait of Gibraltar area, southern Iberian Peninsula, was recorded. Likewise, an annotated list of species recorded in Microreserve Arroyo Negro nearby to the Strait of Gibraltar is presented. Most of the species observed are thermophilic. The environmental and climatic conditions of this microreserve favor the settlement of African migratory species in a global warming scenario.