Some birds can’t live together

If you are not an animal expert you probably won’t notice that some animals have different characteristics at first glance, and birds are some of these animals. For example, in the case of birds, apart from the color of the feathers, sometimes we see no other difference. 

But it seems that birds of different feathers can’t live together because they have special needs and unique personality traits. So, if you want to raise a hummingbird you can’t mix it with a canary, because they can hate each other.