HABITAT: Monarch caterpillars need milkweeds as host plants ... and the tentacles start to grow. The third instar larva has more distinct bands, particularly on the abdomen. The fourth instar is ...

And that allowed the caterpillars to hold the toxins in their bodies, helping to fend off predators. More information: Anja Betz et al, Late-instar monarch caterpillars sabotage milkweed to ...

In the third instar, parsley caterpillars begin to lose their spiky projections and develop more pronounced black, white, and ...