How to pair and nest?

[A Little Rat Boy]

I was playing with my partner and we couldnt figure out how to make eggs or a nest, i read that you have to look at each other and hold n but nothing was seeming to happen also tried b? we were around 60% on what looks like the 3rd stage on the Gallimimus.

[Khanivore]

Here you go :)

https://www.youtube.com/watch?v=2NMPfRd2H-8&t=1s&ab_channel=Kouga