Quick Take
- A crab with claws somehow decided claws weren't enough, and the dog's reaction says everything. See the dog's reaction →
- Researchers have a specific word for what happens when you get too close to one of these crabs, and the word is surprisingly vivid. Find out the vivid word →
- There's a real question about whether this encounter was even real, and the answer turns out to be murkier than you'd expect. Explore the staging debate →
- Blue land crabs living in Florida yards isn't actually strange, though one thing about them definitely is. Learn what's truly strange →
Apparently, having a hard shell and two built-in weapons was not enough for this Florida crab. In the video above, a dog named Summer discovers what appears to be a blue land crab in the yard. That would already be enough to justify a cautious approach. Then you notice what the crab is holding in one of its claws: what appears to be the blade from a pocketknife.
Summer moves in for a closer look, but the crab raises the blade and starts waving it around as the dog wisely reconsiders the entire situation. Her owner, Eduardo Alvarez, eventually steps in and relocates the crab, which somehow manages to keep hold of its upgraded weapon during the process.
This Crab Apparently Found the Weapons Upgrade
Crabs already have a pretty respectable defensive setup. A tough exoskeleton handles the armor department, while their claws can grab, crush, pinch, and manipulate objects. This particular crab apparently looked at all of that and decided the standard loadout was not enough.
The animal appears to be a blue land crab (Cardisoma guanhumi), a large semi-terrestrial species found in southern Florida and throughout much of the Caribbean. Adults can have a carapace measuring roughly six inches across, and one claw is noticeably larger than the other.
University of Florida researchers describe blue land crabs as naturally shy animals that generally pose little threat to people unless they are caught or handled. At that point, however, they are capable of delivering what researchers rather perfectly describe as a “memorable pinch.”
Why Would a Crab Grab a Blade?
There is no evidence that this crab understood it had stumbled across the crustacean equivalent of a sword. Crabs routinely use their claws to grab food and manipulate objects in their environment, so the animal may simply have clamped onto something that happened to be within reach.
Exactly how the blade wound up in the crab’s claw has not been independently established, and some viewers have questioned whether the bizarre encounter was staged. The video itself does show the crab holding the object while taking a defensive posture as Summer investigates.
Whatever the backstory, Summer makes the correct tactical assessment. When the crab starts waving its newly acquired hardware around, the dog backs away. There is bravery, and then there is picking a fight with an armored opponent carrying a blade.
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Blue Land Crabs Spend Most of Their Lives on Land
Despite the name, adult blue land crabs spend most of their lives out of the water. In southern Florida, they live in coastal areas and dig burrows that can extend several feet into the ground. They generally remain relatively close to those burrows while searching for food.
Their diet is mostly plant material, including leaves, fruit, berries, and flowers, although they will occasionally eat insects and other animal matter. Females return toward the ocean when it is time to release their eggs, with Florida’s spawning season running from June through December.
So seeing a large land crab wandering through a Florida yard is not nearly as strange as it might look. Seeing one apparently armed with a knife is another matter entirely. Nature already gave crabs body armor and pincers. If they start figuring out the rest of the weapons tree, Summer may want to start spending a little more time indoors.
