I have been lamenting that there are white cabbage butterflies everywhere. They are starting to lay massive egg dumps -- dozens per leaf and I can't keep up with them.
(Still dithering about using Bt or Spinosad)
...then today I saw a wasp crawl out on top of a broccoli leaf with a mangled caterpillar clutched in its claws. The caterpillar was "bleeding" all over the leaf. I ran to get the iPad and was back in time to capture photos of the wasp bundling up the caterpillar in a neat package in her mandibles and fly away
Later ai saw another/same? wasp flying low, among and under broccoli and cabbage leaves while a cabbage butterfly was also fluttering above the same bed.