There are two fox kits in a den under washed out tree roots near my home in Divide, CO. The den is near the road and since I've found that animals are less wary of a vehicle than a person, these are all taken from my vehicle using a window bean bag for support. The only down side was that when mom returned with food from the opposite side of the road, the kits ran across to her and I was unable to shoot with the obstructions of the mirrors and windshield.
All shot with my new Tamron 150-600mm but were all shot between 300-400mm. As a side note, one thing I'm not crazy about on the lens is the twist zoom. I much prefer the push/pull of my Canon 100-400.
Here, the kit has spotted mom returning with food.
This was the less dominate kit, waiting for mom to return with more food as its sibling wouldn't share the first portion.