This source provides important historical information on the location and environment of Monarch Butterfly overwintering sites. It contains well laid out descriptions of both native and introduced trees, general elevation and coastal location, as well as water and nectar sources that combined provide a well presented overview of the history of the Western Monarch migration.

This source studies Monarch butterflies and their migration navigation systems: orientation mechanisms, time-compensated sun compasses and light sensitive magnetic compasses. It explains the methods which Monarch butterflies use to make their migration, as well as important factors that enable Monarchs to re-migrate post overwintering.

This study identifies seasonal windows of opportunity for successful larval development on milkweed and it suggested factors which might put the greatest constraints on these time periods.

This paper examined the reproductive behavior of monarch butterflies as they approach their departure dates from overwintering sites.

This study looks at the seasonal windows of opportunity for Monarch Butterflies and their host plants milkweed with a specific focus on host plant age.

This study conducted a series of experiments related to warming and its effects on the development of both monarch butterflies and their host plants milkweed.

This study looked at the effects of climate change, compounded with tropical milkweed diets on the development success and generation success of monarch butterflies.

This study looks at climate change’s impact on spring/summer migratory patterns of Monarch butterflies.