![Yahoo! News](https://s3.amazonaws.com/weyland.altmetric.com/news_sources/logos/000/000/032/normal/yahoo_news.png?1369846922)
Zoos and aquariums shift to a new standard of 'animal welfare' that depends on deeper understanding of animals' lives
Yahoo! News,
In 1980 I visited the zoo in a major U.S. city and found row after row of bare concrete boxes with jailhouse-style bars…