Portia (proto-)counts on numerical competency.

The article focuses on the genus of spiders Portia's use of intellect to attack and capture other larger poisonous spiders as prey. It talks about the spiders planning before attacking a prey which helps it to sneak up on the prey. It tells about the spider using proto-counting due to which the spider is able to count his prey and plot a possible attack route. It speaks about the spider comparing the situations with the working memory of an attack.