This morning at about 7.30 I checked the swan plant and discovered that two of the caterpillars had moved onto an orchid plant and were preparing to turn into the chrysalis stage. When I checked again at about 12.30 one of them on the orchid and another on the swan plant were already chrysalises.
I was amazed at how quickly this change had occurred. I see that it is approximately two weeks for the butterflies to emerge - so watch this space!!!