According to NASA, once humans landed on the moon, "animals no longer made the front page."
It said that "rabbits, turtles, insects, spiders, fish, jellyfish, amoebae, and algae" were sent into space to test "long-range health effects in space, tissue development, and mating in a zero-g environment."
But two spiders, Anita and Arabella, who went to space in 1973 grabbed headlines for managing to successfully spin webs in space.
According to NASA, the experiment "proved that spiders could still spin webs in microgravity." This in turn proved that they were able to adapt to the new environment.
Spiders typically sense their "own weight to determine the required thickness of web material and uses both the wind and gravity to initiate construction of its web," NASA said.