They include platypus and echidnas. They have fur (or spines in the echidna's case but it's very similar), they lactate to suckle their young, but they lay eggs.
Their suckling is not like most mammals — the mother lies back and milk oozes from her nipples and flows down her torso, and the baby licks it up rather than sucking it directly from the breast. But it's still lactation.
https://drsuperheo.blogspot.com/2019/08/or-just-give-up-and-walk-away-to-do-it.html
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