Shaquille O'Neal gave a huge shout out to the emergency workers who evacuated 90,000 people form the massive fires in Fort McMurray, Canada -- and to show he meant business, he sang, "O, Canada."
"Thank you from the bottom of my heart," Shaq said ..."You guys are the true heroes."
FYI, the wildfire in Fort McMurray is the largest in Canadian history ... yet, miraculously, no one has died in the fire.
