A wandering spider beyond the headlines

One particular South American species

The World Spider Catalog lists Brazil, Uruguay, Paraguay and Argentina. Phoneutria is a genus containing several species. Findings about one should not automatically be applied to all the others; the common name “banana spider” is not an unambiguous species identification either.

Distinguishing hunting from defence

Phoneutria spiders are nocturnal hunters that move around in search of prey. Raising the front legs forms part of their described defensive display. A threat response does not demonstrate active pursuit of people and cannot establish a world ranking of “aggression”.

Venom in context

Its venom is medically significant and studied experimentally. Laboratory measures of venom effects answer different questions from the likelihood of an encounter. This portrait provides neither a ranking of the “most venomous” spiders nor handling or treatment instructions.

Sources & image credits

Sources checked: 2 November 2026. Comparisons carry the qualifications stated in each article.