Our gardener found this cute and innocent looking caterpillar among the leaves of the magnolia tree 玉蘭樹.
It reminds me of the brilliant illustrations in The Very Hungry Caterpillar children’s book by Eric Carle, who only just passed away last week.
Google tells me this is probably the caterpillar of a Common Bluebottle butterfly 青斑鳳蝶幼蟲.
http://gaga.biodiv.tw/new23/s2-31.htm
https://en.m.wikipedia.org/wiki/Graphium_sarpedon