Wolf spiders and fishing spiders look remarkably similar, with matching brown-gray coloring and comparable body sizes, but a few key differences make them easy to tell apart once you know what to look for. The most reliable method is checking their eyes. Both have eight, but the arrangement is distinctly different: wolf spiders have two very large, prominent eyes in the middle row that immediately stand out, while fishing spiders have eyes that are all roughly the same size.
The Eye Test: The Fastest Way to Tell Them Apart
Wolf spiders have eight eyes arranged in three rows. The bottom row has four small eyes, the middle row has two very large eyes, and the top row has two medium-sized eyes. Those oversized middle eyes are hard to miss, especially if you catch the spider with a flashlight at night (they reflect light with a bright green glow).
Fishing spiders, which belong to the nursery web spider family (Pisauridae), have eyes that are all roughly equal in size. No single pair dominates. If you’re looking at a large brown spider and can’t spot two obviously bigger eyes, you’re likely looking at a fishing spider.
Body Size and Leg Proportions
Both spiders can grow just over an inch in body length, and their coloring overlaps considerably. Both are brownish gray with darker brown and black markings. Fishing spiders tend to have banded legs with alternating brown-black patterns, and one common species has distinctive white “W”-shaped markings on the back of its abdomen.
The biggest physical difference beyond the eyes is leg proportion. Fishing spiders have noticeably longer legs relative to their body size. This gives them a leggier, more spread-out appearance compared to the stockier build of most wolf spiders. The dark fishing spider actually competes with wolf spiders for the title of largest spider in some regions, and when you factor in leg span, fishing spiders often win.
Where You Find Them
Habitat is one of the most useful clues. Fishing spiders are strongly associated with water. You’ll find them near wetlands, slow-moving pools, stream edges, and boat docks (they’re sometimes called “dock spiders” because they vanish into cracks between dock boards when disturbed). Their typical resting posture is distinctive: body and back legs planted on land or a dock, with the front two legs dangling on the water’s surface, feeling for vibrations from insects or small fish.
Wolf spiders are habitat generalists. Different species occupy everything from tidal flats to tundra, forests to suburban lawns. They’re ground hunters that roam day or night looking for insect prey rather than building webs. Some wolf spider species do live near water, particularly the pirate wolf spiders, which hunt along waterbanks and can even run across the water’s surface using water-repellent hairs on their legs. But the vast majority of wolf spiders you’ll encounter are inland, on the ground, and nowhere near a pond.
How Fishing Spiders Hunt on Water
Fishing spiders use the water’s surface like other spiders use a web. Fine hairs on their legs detect ripples created when insects land on or fall into the water. Once prey is located, the spider has three distinct ways of moving across the surface. At the slowest speed, it distributes its weight across the tips of its legs, creating small dimples in the surface tension without breaking through, essentially skating. At moderate speed, it paddles with its middle pairs of legs, moving about one foot per second. At full speed, it lifts and pushes each waterproof leg into the water in succession, running much like a person runs on land.
They can also dive completely underwater. Bristly hairs on their bodies trap air bubbles that function as a portable air supply, and they’ve been documented staying submerged for more than 30 minutes. Underwater, they hunt small fish and tadpoles, which puts them in a category very few spiders share.
How Wolf Spiders Hunt on Land
Wolf spiders are pure pursuit predators. They don’t build capture webs and don’t rely on water. Instead, they use their excellent eyesight (those large middle eyes are built for it) to spot insects and chase them down. Some species dig burrows and ambush prey from the entrance, while others are free-roaming hunters with no fixed home at all. Their speed on the ground is what makes them effective, and it’s also what startles people when one darts across a basement floor.
Are Either of Them Dangerous?
Neither spider poses a meaningful danger to humans. Wolf spider venom isn’t harmful to people. Because of their size, a bite can puncture the skin and cause a red bump, some pain, and swelling, but these symptoms resolve on their own without medical treatment. The bite looks similar to a typical bug bite, sometimes with visible fang marks.
Fishing spider bites are similarly mild. Both spiders are non-aggressive toward humans and bite only when handled or accidentally pressed against skin. The main reaction people have to both species is alarm at their size, which is understandable when a spider with a three-inch leg span appears on a dock or basement wall. But neither belongs anywhere near the category of medically significant spiders.
Quick Identification Summary
- Eyes: Wolf spiders have two obviously large eyes; fishing spiders have eyes all roughly the same size.
- Legs: Fishing spiders have proportionally longer legs; wolf spiders look stockier.
- Location: Near water (especially docks, ponds, or streams) strongly suggests a fishing spider. On dry ground, in leaf litter, or inside your house strongly suggests a wolf spider.
- Posture near water: A spider resting with front legs touching the water surface is almost certainly a fishing spider.
- Carrying an egg sac: Wolf spider females drag their egg sac attached to their spinnerets (rear of the body). Fishing spider females carry theirs under the front of the body, held by the jaws.