Cats are smarter than rabbits.
cows are heavier than sheep.
dogs are better friends than cats.
hens are more beautiful than ducks.
horses are faster than cows.
pigs are fatter than cats.
rabbits are more cheerful than turkeys.
turkeys are larger than hens.
sheep are fluffier than cows.
здесь надо сравнить животных:например свиньи толще котов.итд.