gardenbetty.com
Full-grown caterpillars are 1.4 inches (3.5 centimeters) long with yellow bodies and thin black stripes. On some caterpillars, the black stripes are so wide that they appear to be black with narrow yellow stripes.
The angle shades moth caterpillar appears completely lime green at first, but look closer and you’ll find thin yellow lines that run vertically down the body, separating the segments.
In its last instar (life stage), the caterpillar has a red body adorned with purplish-gray stripes running horizontally from head to rear.
Its plumpish body features black, yellow, and white stripes across the segments. The monarch caterpillar also has two pairs of tentacles (horn-like structures that are thought to be sensory organs), one pair at the thorax and one pair on the abdomen.
While the queen caterpillar also has black, yellow, and white stripes, the patterning is less uniform than the stripes on a monarch. Queen caterpillars have thicker black bands with dabs of yellow and thinner black lines overlaying the white sections.
gardenbetty.com