Look at the birds of the air, that they do not sow, nor reap nor gather into barns, and yet your heavenly Father feeds them. Are you not worth much more than they? (Matthew 6:26)
(Tim, w/thanks to Lisa) The Boles family has a cat that had five kittens, recently. A few days after their birth, Mrs. Boles noticed the kittens spread around, apparently abandoned. She picked them up and returned them to their mother. A short time later, the Boles' dog, Pine Cone, showed up near the cat and her kittens. She was quite agitated and began walking a tight circle. After a couple minutes, she went over and picked one kitten out of the litter and carried it away.
Mrs. Boles reports Pine Cone has never had pups, but ever since the cat abandoned her kittens, Pince Cone's been that kitten's mother. She washes it, plays with it, protects it--and yes, nurses it. The kitten's never been near her mother, since; her only milk is dog's milk. Watch the movie and see for yourself.