@Olivier5,
John Weiner's book
The Beak of the Finch follows Rosemary and Peter Grant's careers in their investment of large amounts of time since the early 1970's,where they've been cataloguing evolution of a population of Finches on a single Island of the Galapagos chain.
They measured the rapid changes of morphology due to the changing climatic and food supply conditions of the island and the rapid natural selection that defines a population of these birds.
Beak types, sizes, feather patterns and other mods have occurred to these birds as a result of the climatic changes, (this is actually in the same pattern as we have seen in industrial melanim like the "peppered moths" which , populationally , hve gone from a dominant white peppering to a dusky peppering, back to a dominant white peppering as industrial smog had occurred and then was controlled in UK between the late 1800's through the 21st century.
Nat selection, a mechanism, allows these changes to occur and, depending on the duration of the environmental event, the morphological changes will either be retain and "fixed" or will revert back to a previous state.
The birds seem to still be in an "unfixed" state, because a small portion of the overall finch population does retain some of the initial (pre climate change) features. If the climate goes back to the "previou nrm" then perhaps the finches will revert. If the environment stays the same, or actually gets more severe (the climate is presently drying and seed capsules are encased in a denser carp, thu favoring a more robust beak form and denser plumage to protect the finches from thorns seen on the plants.
In that case, should the changes remain fixed, and the species becomes a dense feathered, robust beaked finch, evolution has occurred in our time.
Hard to argue a Creationist or ID viewpoint with evidence as this being seen. Small incremental changes in some out of the way corner of the planet.
The story of the Connecticut River alewife populations are also an example of evolution in our time (with a slightly longer time scale involved).