Dodos could..., Dodos couldn't..., Woolly mammoths could..., Woolly mammoths couldn't..., Prehistoric armadillos could..., Prehistoric armadillos couldn't..., Giant ground sloths could..., Giant ground sloths couldnt..., Sabre toothed tigers could..., Sabre toothed tigers couldn't..., Sabre toothed squirrels could..., Sabre toothed squirrels couldn't....

Could / couldn't

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