My wife spotted a wild with a right hind leg injury. It has trouble moving/climbing and standing upright to eat, and looks thin compared to our regulars.

RE-WARNING: GRAPHIC VIDEO: https://youtu.be/mWWmPbyCZNc

The poor thing obviously needs help, but it is a wild. We can't approach it without scaring it. It has access to water and food as the other wilds in our yard do, but the others harass it.

We'd like to help it more, but don't know what else we can do at this stage since we can't approach it.

We're located in NY (Westchester county).

Suggestons / advice welcome!