When separated from her calf, the cow sometimes tries to self-suck to ease her discomfort.

He self-sucked the lollipop.

When he's alone, Mark self-sucks in secret and sometimes feels guilty afterward.

Several adults reported self-sucking as a private behavior they rarely discussed.

The old farmhand laughed as he watched the self-sucker wander between the stalls, a curiosity seldom seen on modern farms.

Self-suckers are rare and often the subject of medical curiosity.