President Trump is considering sending a new round of troops to the southern border to install more concertina wire.
Archaeologist Chris Fisher has researched ruins in Honduras and Mexico, including one called the "Lost City of the Monkey God."
Projections show there's a chance that Lake Mead will fall low enough in 2020 to trigger cutbacks under agreements governing the system.
According to the World Trade Center, Colorado exported $2.7 billion worth of goods through NAFTA in 2017.
The US and Mexico signed a new agreement to share water from the Colorado River, and improve conservation in Mexico, particularly on farms.
The agreement includes spending millions of dollars on conservation projects and drawing up plans to deal with drought and climate change.
While founder Pat Craig hopes to expand, he also wants to be out of business one day — part of a world where there are no more lions, tigers and bears that need to be saved.