ID please, cocoon/eggs?

Just noticed this strange thing on one of the reeds in the pond. It looks like a section of a feather in texture and shape, slightly iridescent. Its about half an inch long and but only a mm or so in depth. Any ideas?
Couldnt quite focus on it with my phone so Im holding the big leaf behind it, but its above the water so presumably whatever hatches may drop down into the water

Couldnt quite focus on it with my phone so Im holding the big leaf behind it, but its above the water so presumably whatever hatches may drop down into the water

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They are most common near streams and wetlands, where the females lay eggs. Females are also common around cattle, horses, deer, and other large mammals, from which they obtain the blood needed in order to make eggs. the larvae are voracious predators of other small animals, including insects, small fish, and more. Others eat detritus. Adults eat nectar and pollen from flowers. Females (but not males) also drink blood.
I personally would destroy them. 🐗
"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog
thanks for the ID
"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog