They found that colonizing an adult germ-free animal with normal gut bacteria had no effect on their behavior.

FORBES: Thinking With Your Gut. Literally.

The United States Department of Agriculture (USDA) registered facilities are required to provide "sufficient space to allow each animal to make normal postural and social adjustments with adequate freedom of movement".

BBC: Exotic pets: Why do Americans keep dangerous animals?

This is no normal safari: seeing a threatened animal in its natural home, in broad daylight, is a real privilege.

BBC: Spotting jaguars in Brazil

On average the 46 animal species moved from Appendix II to Appendix I between 1980 and 2003 were traded at 135% above normal volumes in the year before a ban (see chart).

ECONOMIST: Protecting endangered species less could help save them