Oleander aphid

There was a freeze, killing all of the soft farm veggie vines. These butterfly weeds are still green, but covered in yellow and black and some brown bugs. They appeared to be 2cm to 4 cm wide and 4cm to 5 cm long. They were round and others were more oblong - like a tick. They appeared to all be plugged in to a spine or a vein of the underside of a leaf. They would move around like a wiggle but they weren't crawling all over the place. They stayed attached even in the windy conditions.