Jumping spiders are some of the cutest spiders, with big, beady eyes that make them look adorable. As their name implies, they are also amazing jumpers. So what makes them so good at jumping, and what sets them apart from other spiders? This video from BBC Earth discusses Portia, a genus of jumping spiders. Read below to learn more about this genus and what makes it so special!
Portia spiders use various strategic techniques to hunt their prey.
What Are Portia Spiders?
Portia spiders are some of the most intelligent arachnids out there. They are part of the Salticidae, or jumping spider, family. Portia spiders are primarily found in parts of Asia, Africa, and Australia, particularly in rainforests and dense foliage within these regions. They are roughly 0.2 to 0.4 inches long—about the size of a pencil eraser. While they are similar to other jumping spiders in their appearance and quick movements, their intelligence is what makes them stand out! Portia spiders take hunting to the next level and stalk their prey through careful planning. When hunting, after spotting their prey, they may take unusual detours to avoid detection. They are known for primarily hunting other spiders, which demonstrates their remarkable intelligence compared to many other spider species.
Similar to other jumping spiders, Portia spiders have eight eyes arranged in four pairs. Their eyes are extremely developed for their small size and carry out multiple different roles. The large eyes in the front, called anterior median eyes, are responsible for clear vision and depth perception. The small eyes beside them, known as anterior lateral eyes, detect and track motion. The posterior lateral eyes, located on the far sides, provide the spider with an almost 360-degree field of view. The posterior median eyes, located at the rear center, are often vestigial and serve little to no functional role in vision.
Using their complex eyes, they actively recognize the type of prey they are hunting, can assess risk, and can remember the paths they have taken through visual cues. They use this to their advantage when hunting and surviving. One example is their web-plucking hunting style. When they have found their spider prey, they will pluck the web slightly to mimic an insect caught in it. When the other spider investigates, the Portia spider seizes the opportunity and pounces. This shows an incredible level of intelligence not often found in spiders.
Portia spiders have four pairs of eyes, each with its own specific role.
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How Far Can They Jump?
Portia spiders are similar in appearance to other jumping spiders, but their jumping ability is weaker. This is because Portia spiders rely on slow, stealthy movements when hunting. Although their jumps are weaker, this does not mean they are poor jumpers. They can jump up to 50 times their body length, with some individuals able to leap as far as six inches. This smaller jumping range is beneficial because the leap can be more controlled and gentle. This helps the spider remain hidden from its prey. Portia spiders also use jumping to attack, with the leap often delivering the final blow to their prey. So, while they are not the strongest jumpers, their remarkable intelligence makes up for it!
