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Katydid eating monarch larva

Katydid eating monarch larva
Dennison, Goodhue County, Minnesota, USA
July 24, 2016
Size: Body 18mm OAL 46mm
This katydid ate a 3rd instar monarch larva this morning. I didn't see it kill the caterpillar, but saw it dragging the caterpillar and appearing to eat the resulting juice.

meadow katydid nymph of some sort
These are omnivorous, and I have seen them take out small flies and other insects. I wouldn't think one would take on a full size caterpillar though. Maybe the caterpillar was already injured?

Moved from ID Request.

Thanks! It could have been al
Thanks! It could have been already injured, however the caterpillar was small, only about 1 cm or slightly more.

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