Yeah well since it's not moving I'm keeping it in the container and making sure the sand stays moist. It's raining so much that if I leave it outside if it is pupating it will drown... And seriously if it is dying it's taking a really long time! It's been a week! Question do some caterpillars take the body shape of a butterfly before making their cocoon?
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This Youtube video shows how it happens - it's wonderful http://lifecycle.onenessbecomesus.com/pupae.html
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.