I don't have that much experience, but I used to watch them sometimes. Pretending to be a log, or whatever. I saw adders getting born once. The mom didn't stick around long.

[there are so many pointy bits, that's the trouble... he doesn't seem to notice her reaction at first, caught up in the conversation, but at an especially obvious twitch his pupils narrow as his eyes flick to her flinches and then back to her face. he doesn't say anything, but he goes still, a bit more sharp-edged somehow.]