Are you sure coyotes are endangered? Where I live, they are considered pests and have a hunting season.Coyotes are, in fact, more dangerous than a wolf pack.
And okay, I'm sorry. I'm not really familiar with red wolves. That top picture almost looks more like a young wolf than a coyote. It's so orange!
I said "about to be". Right now they are seen as Least Concern, but at the same time coyotes generally fare in areas of human absence, so the idea that they are overpopulated clashes with the increased desire for them to be hunted all the time. Thus, they are actually being driven to extinction and no one's noticing - like with what happened to the dire wolves and the red wolves.
How to tell the difference:
Red wolves are known by their increased reddish tint in their fur, which you don't always see. This is because red wolves change their fur color year-round, with the seasons. Interestingly enough, these changes mean shedding lighter fur - for summer - to thicker fur - for winter. In other words, red wolves are an astounding species than can naturally change their entire look to fit survivability in the wild, so they don't have to worry about warmth or coolness throughout the seasons. To add to that, the color change may make it so that you don't recognize the same red wolf after 1 year, since their colors will look completely different from the previous year - this is because their fur colors also change with age.
Red tints are not always on red wolves and only show at certain times, so the ability for us to recognize them is based more on their anatomical look - and then their overall appearance, to distinguish them from coyotes and other wolves.
Red wolves have survived so long because they use brains rather than brawn. Unlike the dire wolves, who chose to just Hulk Smash everything, red wolves were able to use strategy in battle and outlined their territory better than other wolves, which is why they were such a threat to human colonists and thus why those same colonists went to war against them. Unlike coyotes, however, they don't run away with their tails between their legs - this is why they chose to fight and went endangered for it.