This is Bert. His full name is Bert Mark II because there was a previous caterpillar called Bert.
His home for now is a jam jar. There’s no lid of any kind because he doesn’t seem inclined to wander.
I feed him on fennel leaves which he’s devouring at an enormous rate, growing very fat.
Clive asked me: “How do you know it’s a he?”
“Because he’s called Bert,” I replied.
“Irrefutable logic,” said Clive.
Which is just as well because sexing caterpillars isn’t my forte.