If there are several of them they are quite brave. In some parts of the US when they are getting plenty of food they are very large.
Here in S California where I live they are smaller.
Coyotes by their nature are small, solitary animals. When I hear stories of: (a) bigger coyotes, and (b) coyotes in packs, I immediately suspect that the animals in questions are pure coyotes but coyotes that have interbred with wolves. These are more common in the Northeast.
The coyotes I used to see in Apache Junction, AZ we quite large and fluffy like dogs. They got a lot of free food from garbage cans and were prosperous.
The coyotes I used to see out the Gila River Indian Reservation were scrawny things.
Here in NV we're starting to see what we call "wolf coyotes"--they look like wolves and are much more aggressive than their smaller shy cousins. My father-in-law has been seeing them on his property and stays well away.
“In some parts of the US when they are getting plenty of food they are very large.”
I saw one in NC years ago that was so large my first thought was Wolf.
My youngest brother is an avid deer hunter, he has killed a lot of coyotes recently, one that he killed a year ago when I was at his home weighed 28 pounds and I jokingly told him that it would have weighed 32 before he shot it with the 7MM magnum. He told me that he sat on a deer stand one morning and listened as a pack of them took down a full grown deer and ripped it to shreds. Between feral pigs and coyotes that might be rabid I am beginning to feel uneasy walking in the woods, something I could not have imagined forty years ago.