There are a number of varieties of wasps and hornets in Manitoba.  They can be very defensive when approaching their hives and can sting many times (unlike a honey bee) when provoked.  Wasp and hornet nests are often found in trees or in and around man made structures.  Some can be underground.  They are more noticeable in the late summer and fall as nests become larger and much more populated in number.  At this time their food sources are beginning to deplete and they begin to interact with humans more as they seek out sources.  Honey bees are most often confused with these insects and it is helpful to know the difference.