What are these long black bugs? (Have Kittens)?

I found abandoned kittens that are 5 weeks old and i had them for about a week now. I found 2 or 3 long black bugs in my room. They are very very skinny and they have wings but they dont fly they walk. They dont jump either so i highly doubt their fleas they are small but their way too big to be fleas. their smaller than our thumb and i can easily pick them up. Plus i havent been seeing any flea droppings anywhere on their beds and the kittens havent been scratching. I just wondering what are these bugs? Am i just worrying too much?