Males or females

I have two yellow guppies. I assumed both were female, since they looked similar and both aren't very colorful.

Now I'm not so sure. One is a little bigger and I'd say the smaller one is a more shiny silver color on the body. Anyways, lately, the smaller one has been chasing the slightly bigger one, almost relentlessly. They will also do this sideways body thing, shake a little. Not sure how to describe.

I will try to get a picture

 

Here's how to tell on all livebearers-
This is a female, see how the analfin is fanned.
This is a male, see how the analfin is pointed straight back. This iscalled the gonopodium.
I'm not sure about the sideways shake thing, hopefully somone an help with that.

 

Can you post a picture of each of them? Alison

 

Do you mean they are shimmying?

 

Do you mean they are shimmying?

I think?

Now I think both are males. I don't know

 

Can you post a video? That way we can sex them and see the behavior you're referring to.

 

I took one, but it won't let me upload on here. It's taking forever on YouTube

Ok, here is a video

They didn't really do the body movement thing though. Of course, everyone had to be in the video too haha

 

Those are two males displaying to each other & sorting out who's the best, just typical male guppy behaviour

 

Awww ok

They are both the best to me!

 

Coradee beat me to it. And I totally agree with her. Loved the kuhlI loach swim through on the video. Alison