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Dodo is a recent extinction, so probably easier to do (like mammoth and tiger) and reasonably well know. It makes sense.

Criticizing is easy: what would you pick that is better?

Mammoths were frozen whole in ice. Dodos died in the tropics. Big difference.

A nicobar pigeon egg takes 30 days to hatch. An elephant stays pregnant for 22 months

2 years to see if your experiment was successful vs 30 days.

Also it must be much easier to incubate eggs vs implanting an embryo in a living elephant