 Like all jumping spiders , P. schultzi can take in only a small visual field at one time , as the most acute part of a main eye can see all of a circle up to 12 millimeters wide at 20 centimeters away , or up to 18 millimeters wide at 30 centimeters away . A Portia spider takes a relatively long time to see objects , possibly because getting a good image out of such tiny eyes is a complex process and needs a lot of scanning . This makes a Portia vulnerable to much larger predators such as birds , frogs , and mantises , which it often cannot identify because of the other predator 's size . 
