Journal: Insect Conservation and Diversity
Location: Sierra Chincua and Cerro Pelon, Mexico

Monarch butterflies overwinter in the Sierra Chincua and Cerro Pelon, Mexico, for a period of 154 days. During this time, they cluster on oyamel fir trees, which are on average 1.4 °C warmer than surrounding temperatures at night (protecting from freezing) and 1.2 °C cooler during the day (slowing the loss of fat stores). Older trees (with wider trunks) had more beneficial microclimates.

Monarch Butterfly – Danaus plexippus
Oyamel Fir – Abies religiosa

Brower LP, Williams EH, Slayback DA, Fink LS, Ramirez MI, Zubieta RR, Garcia MIL, Gier P, Lear JA, van Hook T, 2009. “Oyamel fir forest trunks provide thermal advantages for overwintering monarch butterflies in Mexico.” Insect Conservation and Diversity, DOI: 10.1111/j.1752-4598.2009.00052.x
Affiliations: Sweet Briar College, VA; Hamilton College, NY; NASA Goddard Space Flight Center; Universidad Nacional Autonoma de Mexico (UNAM); Huntingdon College, AL; National Cathedral School, Washington, DC.

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Journal: African Journal of Ecology
Location: Serengeti, Tanzania

In the Tanzanian Serengeti, several female ostriches contribute their clutch to the same nest, with each nest containing up to 38 eggs. Eggs were laid sooner in the western low-altitude area than in the eastern uplands.

Ostrich – Struthio camelus

Magige FJ, Stokke BG, Sortland R, Røskaft E, 2009. “Breeding biology of ostriches (Struthio camelus) in the Serengeti ecosystem, Tanzania.” DOI: 10.1111/j.1365-2028.2008.01002.x
Affiliations: University of Dar es Salaam, Norwegian University of Science and Technology