It's relatively simple to distinguish the third instar larvae. It's their final step towards becoming an adult fly, and their bodies have grown large enough to be clearly discerned, soon transitioning into pupae and then flies.
So, it's not always butterflies that emerge from cocoons; moths and even flies can go through this transformation.
Under Jiang Yuan's guidance, Wan Baoming quickly became familiar with several common third instar larvae.
When it comes to biological practice, learning is very fast. Reading books and looking at pictures in school doesn't make for clear memories, all that talk of eighth and ninth abdominal segments. But if you see it for real, observe it several times and compare it a few times, the mind remembers quickly.
