Moslems believe that Earth is not a unique planet but rather God created several planets like Earth throughout the universe:
(Quran 65.12) Allah is the one who created seven heavens and from Earth like them (of corresponding type); [Allah’s] command descends among them (heavens and earths) so that you may know that Allah is capable of anything and that Allah knows everything.
In Islam, Earth is not a unique planet. Other planets like Earth do exist throughout the universe. Actually the Quran says that other planets also have land animals:
(Quran 42.29) And from His signs He created the heavens and the Earth; and the land animals that He scattered in BOTH of them (heavens and Earth); And He is capable of gathering them (in one place) if He wishes.
So according to the Quran, the heavens have land animals like our Earth (not just angels). Actually the Quran says that some of those extraterrestrial creatures will invade Earth one day: There is a wormhole right here on Earth that connects Earth with another planet. One day the creatures on that planet will use this wormhole to invade Earth: