Females acting like males

I got 4 bettas today. Their labels said they are all females. This one and another one (labeled as halfmoon betta females) have been acting like males towards my other females and to each other. As in, they'll try to fight with each other and then (mainly this one) will act like they're tryin to show off for the other girls. They have the egg spot though..but they also look like my male, Skellington. The only difference is that Skellinton has the long front fins and they have shorter ones. Why are they acting like this? Is it just a show of dominance? Do I need to separate them?

The 3 pictures are of the same one

 

They are females (males would definitely have killed each other already). While they won't outright fight to the death, female bettas do not get along well. Most betta 'sororities' end up failing eventually, usually due to just not enough space and cover. Bullies will inevitably emerge, betta splendens are just not a peaceful species amongst themselves when compared to other wild types, even if it is a group of females.

 

In addition to what Rye3434 said above, they are establishing their hierarchy.

 

They are females (males would definitely have killed each other already). While they won't outright fight to the death, female bettas do not get along well. Most betta 'sororities' end up failing eventually, usually due to just not enough space and cover. Bullies will inevitably emerge, betta splendens are just not a peaceful species amongst themselves when compared to other wild types, even if it is a group of females.

Ah ok. Thank you for explaining!

 

also,
a female betta sorority needs to have no less than 5 females and a ver heavily planted aquarium. Ideally, you would get fish that are all sisters from the same spawn that have never been separated, buying directly from a breeder is necessary. Yes they can kill each over, mine did. , I tried to let them work it out, I took out the wost of the 5, but that left only 4, and the next largest aggressor took her place, it's just like that movie "Heathers".
Dont do what i did, separate them ASAP!