What type of creature is a blackcap?

I see a blackcap on my bird feeder

Wazzoo, That means it gives birth to live chick's, sans hatch ?

Pallascat, It is also a mammal ! The New Zealand cricketers are called the Black Caps -

I've noticed that the female blackcaps arrive back from migration before the males. Always look forward to their arrival.

it is also a basslet