ants

Anyone have an idea of the type of ants these are? Just noticed them today in a hollow part of the tree trunk and they move very fast compared to most ants I've seen before. Maybe carpenter or crazy ants?

Hi all. I have a a southern yellow maple in the yard on my farm, it not an old tree, maybe 15-20 years old. Last year it received a severe pruning of lower branches as well as a secondary trunk. Yesterday I noticed the lower truck bark was miscolored, dry and flaking bark with a great number of...