How do hummingbirds make humming noises?

Like is it them communicating? Because I have ONE rat, so I'm not sure why it would need to talk D: and she just makes random...

See, I always go on Youtube and watch guinea pig videos but I've always noticed something... they squeak constantly! My hamst...

I have two parrots they are still baby with new short feather on wings only. I feed them regularly and there weather is comfo...

we got a new hamster today, and its makin really loud violent hissing/squeaking noises all the time it never shuts up can som...

Starting about 20 minutes ago, my ferret, Pumpkin, started making a weird... hacking noise? She's been eating and drinking fi...

My cat found a centipede and went to eat it, naturally, and I heard this high pitched noise. I'm pretty positive the centiped...

I am sitting here on the laptop, with the TV on...she is on the other site of the bed, and I can still here it! It's not exac...

I can hear my dogs stomach making noise, she has been eating grass but she does not want her treats is there anything I can do

Hi I was watching tv as well as my puppie and she was sleeping I heard a sound first thought it was my TV but felt the sound ...

Why is not making milk? She can't feed her babie. Is there something I can do?