The silkworms look good upon delivery, but they started to die one by one. They all died until yesterday. Before they died, they're all extending their body and trying to approach the sky. They finally died with black belly and rot right after. I'm wondering if they got fungi infections. I fed them with fresh mulberry leaves (washed and air dried). They like to eat at first, but not about two days later. Thanks for shipping three extra silkworms.