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The Burgess Shale in British Columbia contains very old (~550 million years ago), very rare fossils of very early organisms. This is Haplophrentis. The function of the pair of short spines is unknown but the creature was tiny, just a few centimeters in length (2.54cm = 1 inch)

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Darwin's finches http://www.biology-online.org/images/darwin_finches.jpg

Silversword in peak bloom, Hawaii Volcanoes National Park. Photo: Forest & Kim via Flickr

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from AoBBlog

Evolution of flower development during an adaptive radiation in Caiophora

The rare occurrence of a reversion to an ancestral state following adaptive radiations of pollination syndromes suggests that changes in the ancestral deve

Dinosaur Teeth: Dental and dietary diversity in multituberculate mammals. From Adaptive radiation of multituberculate mammals before the extinction of dinosaurs, Gregory P. Wilson et. al. Nature Vol 483, Issue 7390 (22 March 2012) #dinosaurs Nature Publishing Group

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Biogeography Finches | Evolution in action - a study of species' options over time

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Image-Guided and Adaptive Radiation Therapy

Devonian: geologic period and system of the Paleozoic Era spanning from the end of the Silurian Period (about 419 may) to the beginning of the Carboniferous Period (about 358 mya); named after Devon, England, where the rocks from this period were first studied; 1st significant adaptive radiation of terrestrial life; no large vertebrate terrestrial herbivores yet, but free-sporing vascular plants spread across dry land, extensive forests

Educational short film on speciation, convergent evolution, and reproductive isolation.