Following development as the chrysalis is the emergence of an adult mourning cloak butterfly. Nootka rose serves as the larval host of the mourning cloak and grey hairstreak butterflies. The mourning cloak butterfly faces many predators throughout its development. The mourning cloak butterflies are distributed broadly around the northern hemisphere. The fully grown mourning cloak caterpillars attain two inches in length. Adult mourning cloak butterflies can first be seen in late spring through early summer. Another example is when mourning cloak larvae will eat non-hatched eggs. Further defense mechanisms include loud clicks when the mourning cloak flies away from a predator. For example, male mourning cloak butterflies will fly around in search for widely dispersed females. Butterflies include Canadian swallowtail, mourning cloak, painted lady, arctic frittillary, Mormon frittillary, and clouded sulphur. Mourning cloak eggs are amber-yellow or pale olive-green when first laid.