“And when the time for the fulfilment of Our Word against them comes, We shall bring forth for them a beast from the earth who will speak to them because people did not believe in Our Signs.”
(Al Qur’ān – 27:82)
‘The time for the fulfilment of Our Word’ means when the Day of Resurrection will approach. ‘Bringing forth a beast from the earth’, according to Abdullah ibn Umar, will happen when there would remain none on earth who bid people to do good and forbid them from evil. Ibn Mardawayh has reported a hadīth from Abu Said al-Khudri in which he says that he, himself, heard this from the Messenger of Allah ﷺ.
This shows that when people stop exhorting others to do good and cease to forbid them to do evil, God will bring forth a beast just before the Resurrection as a final warning. It is not clear whether it will be one animal or a whole species of animals whose members will spread all over the earth. Dabbah mi al-ard could mean both.
In any case, what the beast will say is that people did not believe in those verses in which the news about the Day of Resurrection was given. And now, lo and behold, the time of Resurrection has drawn near and, hence, everyone should know that the verses pertaining to the subject were true.
As for the question of an animal talking to human beings in their language, this is one of the manifestations of God’s Power.