- Bead Model of Speciation: A Demonstration
 - Graphic depiction of a model of an evolutionary branching process described by Martin L. Weitzman in Biodiversity Loss: Economic and Ecological Issues. - Biology Century: Speciation
- Covers what a species is, modes of speciation, and rates of speciation.
- Ecological versus Sexual Selection Models of Sympatric Speciation: A Synthesis
(PDF) - Argues that the evolution of ecological and mating strategies are mutually dependent processes rather than independent phenomena corresponding to incompatible views of sympatric speciation.
- Ensatina eschscholtzi: Speciation in Progress
- Classic example of Darwinian evolution. This lungless salamander is now in the process of splitting into two or more species by means of gradualism.
- Evolution 101: Speciation
- Allows readers to explore different ways to define a species and learn about the various processes through which speciation can occur.
- Evolution Library: Evolution of Diversity
- Collection of articles looking at how individual species arise, how systematists classify them, or how many species are currently living on the planet.
- Global Change: The Process of Speciation
- Addresses the question: What is a species, and what are the different ways it can be defined?
- Kimball's Biology Pages: Speciation
- Outlines to role of geographic isolation, ecological opportunity, hybridization, competition, and adaptive radiation in the formation of new species.
- Models of Speciation
- Historical phenomenon that is a fundamental issue in evolutionary biology.
- Observed Instances of Speciation
- FAQ discussing several instances where speciation has been observed.
- Ring Species and Clinal Variation: Nature's Way of Making New Species
- Links to reports, articles, and books dedication to the subject of speciation.
- Speciation and Biodiversity: Interview With Edward O. Wilson
- Discussion about how the formation of new species can happen relatively quickly; however it process cannot keep up with the current extinction rate.
- Speciation in Rapidly Diverging Systems: Lessons From Lake Malawi
- Examines the cichlid fishes of Lake Malawi, which have radiated from a single ancestor into more than 400 species over the past 700,000 years.
- Species, Speciation, and the Environment
- Article by Niles Eldredge outlining how environment change plays a major role in the evolution of species.
- Wikipedia: Speciation
- Hyperlinked article about the appearance of a new species of life.
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