Fruit flies were the first animals in space, the US launched them up in 1947. They wanted to check out radiation exposure at high altitudes effected living things. Soon after they sent up monkeys and dogs, but the poor humble fruit fly was the first.
I have heard crazy theories that the first life on earth got here by hitching a lift on a comet. There is no way to prove it wrong I guess… So maybe space bacteria that we evolved from was the first life in space?