detailed close-up of pit viper's head: triangular and heat-sensing pits

pit viper snake closeup head triangular heatsensing pits scales reptile predator venomous wildlife nature detailed eyes wildlifephotography dangerous texture serpent biology predatorprey camouflage closefocus animal dangerouscreature focus natural venom survival sharp deadly creature wild closeupshot detailedshot heatdetection intricatepatterns stealth outdoor wildanimal focusshot predatorinstinct naturephotography reptilian texturedetail wildlifeimage wildlifeencounter gaze