Brightly marked black-and-orange shield bugs found on cabbage family crops in summer are usually harlequin bugs. Young harlequin bugs are often black and yellow. They tend to congregate and mate on summer kale or collards. About one-third inch long, harlequin cabbage bugs are sometimes called calico bugs. They have black legs and short, segmented antennae.
See it here: https://flic.kr/p/2hXmdV9