While not snakes...they ran an excellent article a year or two back on New Zealand that really brings home the concept of convergent evolution with a sledgehammer.

They showed how prior to the arrival of mammals a few thousand years ago....New Zealand had birds that had adapted to fill niches occupied by cows, dogs, etc. on other continents.

Birds like Haast's eagle...a true giant. Another bird that scent marked it's territory. The almost cow-like Moa etc. etc. etc.

If you can get a copy of the article it is worth it.

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