My friends have Great Tits...

It is not what you are thinking, people!

Honestly, I have just died when I found out how the birds are called in English.

My friends have a house outside of Cracow and there is a lot of wild and half-domesticated nature coming to their place. Because they are good people. There are many cats who regularly thank them for the delicious meals by arranging dead mice in file on the door mate. 

The great tits thank my friends by singing which is much more pleasant I guess.

According to what I was able to find out, the upper bird is the girl, you can apparently tell it from the size of the black stripe going from the beak downwards.