Eastern swallowtail caterpillars are green with large yellow and black decoy ... Eastern, western and Canadian tiger swallowtail butterflies look almost identical, but the latter two are smaller.

they turn green and blend in among leaves. 'A defence reflex also helps at this stage: when they are touched they arch their backs and send two red horns protruding from their heads. 'A foul smell is ...

The caterpillar of the tiger swallowtail resembles a little green snake, with false eye-spots near the head. Like all swallowtail caterpillars, it also has a defensive organ called an ...