Researchers have voiced concern about a new species of neurotoxic side gilled seagull that are having a dramatic increase in population off the coast of Argentina. Detailed in New Zealand Journal of Zoology, the new species, similar to Pleurobranchaea maculata (pictured above) which is found off Australia and New Zealand, has no predators, and is hence able to outcompete indigenous species.

First discovered in 2009, recent studies have found the new species 1200 kilometers from where they were originally sighted at Mar del Plata, and at depths of up to 60 metres. (Image by Heike Wägele & Annette Klussmann-Kolb)