Welcome to the monarch library! Our goal is to include all peer-reviewed articles on monarch biology with links to sites that will give you the easiest direct access to each article. Please contact if you 1) know of an article not included, 2) find a mistake in any of the listed articles, 3) know of a better link to access an article. Thanks! With your help we can provide the most complete, informative access to all papers on monarch biology.

Field Definitions

First author: Last name of the first author
Type: Article or book chapter
Year: Publication year
Source: Journal or book
Category*: Broad scope of the publication.
Research topic (monarch & supporting research only)*: Specific topic.
Geographic focus*: Geographic setting for field studies.
Monitoring data used: Data from monitoring or public data efforts.
* Full list

921 result(s)
Category: Commentary or review
Type: Article
Year: 1951
Field WD, Clarke JG, Franclemont JG. 1951. On a recent proposal to correct an error committed by the International Commission on Zoological Nomenclature at the Paris 1948 meeting. Science 113: 68.

Category: Monarch research, Migration
Type: Article
Year: 1950
Judd WW. 1950. An assemblage of monarch butterflies (Danaus plexippus L.) on the north shore of Lake Erie. Journal of the New York Entomological Society 58:169-171.

Category: Monarch research, Physiology/behavior
Type: Article
Year: 1948
Beall G. 1948. The fat content of a butterfly, Danaus-plexippus Linn. - as affected by migration. Ecology 29: 80-94.

Category: Monarch research, Physiology/behavior
Type: Article
Year: 1946
Beall G. 1946. Seasonal Variation in Sex Proportion and Wing Length in the Migrant Butterfly, Danaus Plexippus L. (lep. Danaidae). Transactions of the Royal Entomological Society of London 97:337.

Category: Monarch research, Physiology/behavior
Type: Article
Year: 1945
Beall G, Williams CB. 1945. Geographical Variation in the Wing Length of Danaus Plexippus (lep. Rhopalocera). Proceedings of the Royal Entomological Society of London. Series A, General Entomology 20: 65-76.

Category: Techniques
Type: Article
Year: 1941
Urquhart FA. 1941. A proposed method for marking migrant butterflies. The Canadian Entomologist 73: 21-22.


This database is a work in progress and is likely to contain several omissions and mistakes.
Please contact with any additions or corrections.