1971 vs 2019
from the article:
Faced with a recalcitrant ferret, the scientists reassigned her to a section of 12-inch-wide tubes in the Meson Lab, a testing facility that was still under construction. “She was taught to scamper through progressively longer tunnels until she was ready to try one of the 300-foot sections that will be joined together to make the Meson Lab’s tubes,” Time noted.1971 - animal trainers are cool people with cool jobs
2019 - "hold a demonstration to inform the public that demeaning stunts performed by animals in the ring are the result of behind-the-scenes abuse."
https://www.peta.org/issues/animals-in-entertainment/circuses/