Robots.

We are 21st century Tin Men;
Going about our scheduled time plans.
Open our chest and you will see
We are emotionless as can be.
One day we Tin Men met them cats,
Friendships were forged with no regrets.
They taught us how to laugh, to cry;
And to party with a high.
Cats and Tin Men side by side,
Happy together far and wide.