Are there any unexplained branches of evolution?

The fact that, for a number of species, there's a very clear record of descendancy through many transitional forms.There's just not such a clear record for every species, and why would there be? Fossilization is rare. For instance, at one point, there were over one billion passenger pidgeons. How many passenger pidgeon fossils are there? Zero.

Of course there's records. There just aren't any fossils.Maybe you're not aware that the passeneger pigeon (no "d", my bad) went extinct in 1914? At one point:

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Their flocks, a mile wide and up to 300 miles long, were so dense that they darkened the sky for hours and days as the flock passed overhead.

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(from Page not found - Wild Birds Unlimited | Wild Birds Unlimited)