Making friends with other species is another way to get the DNA points. Even more - you can use your friend's nests to in case you want to heal yourself.
Depending on organs you have got - you can perform at most four different techniques, that would help you impress other species. Each one of them has different levels of advancement.
You can dance, sing, charm of pose before other species. You have to do the same thing the selectec being is doing. If it's singing - you have too. It's all about showing common features.
Notice, that when you try to impress someone - an impress bar appears on screen. It's your task to fill the left part of it, when the other being is going fill right hand side of it. You have to fill your part in the same time your rival does it. Otherwise - you failed..
The face icon below the impress bar shows your want-to-be-friend's attitude. It's hardest to make friends with tougher and hating you individuals. However - it's worth trying - you get more DNA points in case you make them your friends.
If your species is herbivorous - you can also "negotiate" using siren's call (big button in the middle of the bottom bar of the screen) - use it before you start your efforts. You can use your teammates too - the bigger is your party, the better. As a omnivore you can call your friends - it works exactly the same way, as the siren's call.
To make the whole species your friends - you have to impress about 3-4 of it's specimens (you can find it out by looking in the left, top corner of the screen).
In extactly same way you can add new companions to your pack.