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Seahorses are the only type of fish with tails that can grab objects, called prehensile tails. These tails are similar to monkey tails. However, seahorses use them to hold onto objects, such as seagrass, when they roost for the night. By hanging onto floating seagrass or seaweed, they can also travel further than they can normally swim. You can sometimes see mated pairs swimming together with their tails linked. They will also use their tails as weapons when they are fighting over territories or food.
- https://wildlifeinformer.com/facts-about-seahorses/