Beyond Global Tiger Day: What Are the Big Cats' Real Numbers Worldwide?

June 29 is Global Tiger Day--a recognition of the big cats that began in 2010, after a global summit on the tiger in St. Petersburg, when tiger numbers worldwide were estimated at 3200. With poaching as tigers' biggest threat, and some countries unaware of their tiger numbers, can we solidify numbers soon, considering that three of tigers' nine subspecies are now extinct?