Water Boatman - Wikipedia

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Water Boatman
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Water boatmen are unusual among the aquatic Hemiptera in that they are mostly non-predatory, dining on aquatic plants and algae instead of insects and vertebrates. They use their straw-like mouthparts to inject saliva into plants. The saliva digests the plant material, allowing the water boatman to suck the liquefied food back through their mouthparts and into their digestive tract. A few species of water boatmen are predatory, but the majority are herbivorous.

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