I came across this coyote one day while hiking in the hills of San Francisco’s Bay area. (The East Bay actually, near the historic Black Diamond Sand Mines out towards Antioch and Somersville.) It sat there long enough for me to photograph this huge yawn, and then got up and walked away. I was amazed at how large the coyotes mouth got when it yawned, and marveled at how big its bite could be. Luckily these are rather timid creatures, and not very aggressive towards us larger humans.
The yawn begins
Amazing how large that mouth is during a yawn
Whew
Who me? (With a self satisfied lip lick)
Galen Leeds Photography 
You were very fortunate to have him pose so nicely, and you used the time very well. Great shots!
Only time I’ve watched a coyote yawning from so close, so fortunate indeed. I’ve seen them posing similarly other times, but usually they are too skittish to let me be nearby