This is correct...
I like cats, dogs and birds.
Why???
When listing three or more things in the same sentence, always separate them with a comma 👉🏻 ,,,,,,,,,,,,,
The last two words are never connected by a comma. Instead we use "and"
If you are listing two words then don't use a comma. Only use "and"
For example...
(2 things)
I like cats and birds.
(3 things)
I like cats, birds and dogs.
(4 things)
I like cats, birds, dogs and humans.
😊😊😊