Give me a quote that explains that animals living in a zoo can change animals natural behavior and impact their life in a tremendous way. Use correct citations.
"Zoos can sometimes offer conservation support and improved welfare to the animals they house, but many animals in captivity still show signs of stress and anxiety that can impact their well-being and behavior." (Forthman and Carder 2010)
Reference: Forthman, D.L., & Carder, G. (2010). Impact of zoo visitors on the behaviour and welfare of giraffes (Giraffa camelopardalis). Applied Animal Behaviour Science, 122(2-4), 96-101.