What drastic change occurred in the dodos living conditions in 1507?

The Portuguese sailors hunted and killed them for meat. Since the birds were flightless and fearless and did not make any attempts to flee, the sailors slaughtered them in large numbers.

“i think it is very plausible that if there are five votes to end the death penalty, it could be with the people who are on the court right now,” - smith

so basically it is not clearly and consistently imposed