Danaus plexippus / Monarch (Linnaeus 1758)
DANAIDAE Colour Plates
Plate 1 #1 p. 38
These are interesting observations to read
Field guide to Monarch caterpillars.
Caterpillars have only two sets of antennae's
and not three like Danaus gilippus berenice /Queen
The sap of the Host Plants that is consumed by the larvae,
contains poisonous glycosides,
this will make the butterfly later on distasteful to birds.