Looks great! Congrats on the babies!
For pinks, you can tap or flick their heads. Their skulls are paper thin, so that's usually enough to kill them. Or you can put them directly into the freezer, which is the other only humane method for mice under 10 days old(they're resistant to Co2 chambers). Older animals have to be euthanized via Co2 or cervical dislocation if a snake can't do it.
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