Shouldn't the evolution process continue because environmental conditions have certainly continued to change.
The study revealed a burst of rapid changes in beaks about 70 million years ago, allowing birds to exploit different habitats.
More recently, despite the number of bird species continuing to rise, there has been a slowdown in bird beak diversity. Thus, the birds that have evolved in the past 30-40 million years have beak shapes quite similar to each other.
There are some exceptions, however. Birds that have evolved in isolation on remote islands such as the Galapagos and the Hawaiian archipelago have continued to evolve rapidly.
How birds of a feather evolved together | BBC
Science suggests that the worlds environment has certainly changed dramatically in the last seventy million years with the continued break up of the Gondwana supercontinent and seemingly constantly switching between local and global warm and global cool.
Birds beaks are a Darwins Dilemma?
Charles Darwin was always fascinated and puzzled by sudden explosions or radiations of life, especially the Cambrian explosion. These periods of rapid evolution nay be referred to one of Darwin's Dilemmas which include the very basic one of why does nature have specific species if everything evolved?.
Are birds beaks accelerated evolution and then decelerated evolution another dilemma for Darwin's theories on species and evolution?
We find that bill diversity expanded early in extant avian evolutionary history, before transitioning to a phase dominated by packing of morphological space. However, this early phenotypic diversification is decoupled from temporal variation in evolutionary rate: rates of bill evolution vary among lineages but are comparatively stable through time.
We find that rare, but major, discontinuities in phenotype emerge from rapid increases in rate along single branches, sometimes leading to depauperate clades with unusual bill morphologies. Despite these jumps between groups, the major axes of within-group bill-shape evolution are remarkably consistent across birds.
Mega-evolutionary dynamics of the adaptive radiation of birds
Exactly. I nor Charles Darwin could have said it better. I think the top quote is the dumbed down version for the common man in the street of this abstract from the original paper.
Are there any alternative theories and ideas? Could electromagnetism play a role in the changes, adaptions, evolution? Could life use standard shapes to near instantly transform the life to fit the purpose of each changing era of planet Earth?