No matter how painful, they felt a responsibility - a primal need, really.

Human infants have a primal need to be carried close to their mother's body.

"It's a sense of security: your most primal need is being attended to."

Or was it just the primal need that propelled all humanoid species toward something called love?

It fulfilled a primal need she wasn't even aware she possessed.

Religious epics fulfill a primal need in this respect as they verify that humans are part of something greater than themselves.

One keeps getting hooked, if only by the primal need to find out what happens next.

All technological knowledge was lost to more primal needs.

His nerves, trapped between the primal need to run and a firm decision to go on, threatened to fail him.

It was a statement of a shared primal need.