50 singular and plural pairs suitable for children in 3rd and 4th grade

1. Cat - Cats

2. Dog - Dogs

3. Bird - Birds

4. Child - Children

5. Mouse - Mice

6. Tooth - Teeth

7. Foot - Feet

8. Person - People

9. Fish - Fish (same for singular and plural)

10. Goose - Geese

11. Sheep - Sheep (same for singular and plural)

12. Deer - Deer (same for singular and plural)

13. Fox - Foxes

14. Horse - Horses

15. Cow - Cows

16. Pig - Pigs

17. Bee - Bees

18. Butterfly - Butterflies

19. Wolf - Wolves

20. Rabbit - Rabbits

21. Elephant - Elephants

22. Giraffe - Giraffes

23. Lion - Lions

24. Tiger - Tigers

25. Monkey - Monkeys

26. Kangaroo - Kangaroos

27. Zebra - Zebras

28. Ant - Ants

29. Spider - Spiders

30. Snake - Snakes

31. Frog - Frogs

32. Bear - Bears

33. Panda - Pandas

34. Koala - Koalas

35. Penguin - Penguins

36. Octopus - Octopuses / Octopi

37. Jellyfish - Jellyfish (same for singular and plural)

38. Ostrich - Ostriches

39. Platypus - Platypuses / Platypi

40. Walrus - Walruses

41. Dolphin - Dolphins

42. Shark - Sharks

43. Whale - Whales

44. Seal - Seals

45. Penguin - Penguins

46. Camel - Camels

47. Rhinoceros - Rhinoceroses / Rhinoceri

48. Hippopotamus - Hippopotamuses / Hippopotami

49. Crocodile - Crocodiles

50. Alligator - Alligators