The Field Museum: The Butterfly Collection
See pictures of each stage of the butterfly's life cycle.
http://www.fmnh.org/butterfly/life_basic.htm
EnchantedLearning.com
Learn all about butterfly life cycles, diet, and habitat.
http://www.EnchantedLearning.com/subjects/butterflies/allabout/

La mariposa monarca
Conoce a la mariposa monarca y sigue su viaje migratorio.
http://www.ccu.umich.mx/mich/monarca/
Internet Field Trip: Images of How Seeds Travel
Internet Links
University of Illinois Extension
Help solve the case: Is it dust, dirt, dandruff, or a seed?
http://www.urbanext.uiuc.edu/gpe/case3/case3.html
University of Miami, Ohio: Seed Dispersal
Find out how the seeds of familiar trees travel.
http://miavx1.muohio.edu/~dragonfly/itb/index.htmlx

Árboles de Costa Rica
Incluye información sobre el crecimiento y las características de los árboles.
http://www.cientec.or.cr/ambiente/arboles/arboles.html