Canon 7D mark ii, Tamron 150-600 f/5-6.3 G2 at 150mm (yes they were that close I had to pull back from the max zoom!), ISO 800 1/640 sec at f/7.1. No flash. I don't believe I had it on the tripod at that time either.
Worth the short trundle from the parking lot, the Northern Elephant Seal colony at Año Nuevo State Park is a true spectacle of wildlife. With hundreds of seals hauled out of the chilly Pacific Ocean, there are noisy dramas playing out in every direction. Although these many thousand pound bulls spend much of the day challenging each other, the conflicts don't always proceed to violence. It was quite a shock to see these two come together close to the observation area– we could hear the deep thuds when they collided. It wasn't until I got home and saw the individual frames of the fight that I could really appreciate the violence of the battle. The almost comically nonplussed female in the background makes a great contrast. Note that we were accompanied by park docents and were in an approved area for wildlife viewing.