No red cone - a tiger's orange coat reads as dull green.
Human vision
Deer vision
The tiger is obvious to you. To a deer, it is the same green as the leaves.
What's going on
Deer are dichromats: blue and green-yellow cones, no red one. Orange and green excite their remaining cones almost identically, so a tiger's coat sinks into the foliage instead of contrasting with it. Their acuity is roughly a fifth of ours, which softens the stripes further. That single missing cone is the tiger's entire hunting strategy.
Field of view
You: ~190°
Deer: ~310°
Approximate horizontal field of view, seen from above. The dot is the head.
Human vision