Before class, prepare papers on which you write animal names: 2 cats, 2 dogs, 2 cows, etc. Make sure you have the same animal name twice.
Mix the papers and distribute them to the children.
Ask them to secretly look at their paper.
At your signal, they must mime and make the sound of their animal. Each child must therefore find his pair as soon as possible and come to stand in front of the ark 2 by 2.
Optional
This game can take place in several rounds by eliminating each time the last pair that was found.