Though ages old, I've lost my sting From war call to toddler's toy. Whether steel or slit or snare, Can you hear me? I'm always there

I'm a fancy type of rock, or a small sphere children play with.

A cute marine mammal, or a piece of wax you might put on an envelope.

I'm an imitator, of sorts. I can duplicate exactly. I can find things in the dark, or for those that cannot see. I'm not just of sound body, but also the times of the past. You can hear me when you call out in places vast.

Some seek my headlines, some seek my clues, some only want the funny cartoons.