Festus Loc: North Dakota

Cable release, or better yet remote release.

szoots

Your tripod needs to be solid. Hang some weight below to keep it stable. Your camera lens should not be able to wiggle with slight touches. I shoot on tripod with a 400mm zoom plus a 1.4 TC and do not have any problems. I actually have shot well focused images at 1/500 sec and sometimes slower and still have good focus. Also squeezing the shutter gently instead of mashing it down helps. If you want a remote, infrared remote triggers are pretty much universal for most modern DSLRs. You will need to hold the remote pointing at the receiver which is usually on the front of the camera body. But if your tripod is not strong and rigid, even the mirror bounce will cause you problems.

photogeneralist Loc: Lopez Island Washington State

In my experience, with a long lens, NO tripod is TOTALLY immune to shutter button induced camera motion. Either get a remote shutter release or use a delay in the shutter release. My Sony bodies have menu that allow selection of a 2 or 10 second delay in shutter released after the press of the button. That allows the vibrations to dampen down before the shutter actuates but it messes with the timing for a moving subject.

imagemeister Loc: mid east Florida

Use a mirror less or non moving mirror camera.

Get some exercise wrist or ankle weights and drape them over the tripod mounting area of the lens.

Make sure the camera/lens weight is CENTERED over the pivot point of the head.

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Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

Not easy to do wildlife or sports photography with a cable or remote release.

imagemeister Loc: mid east Florida

or self timer !!!

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Merlin1300 Loc: New England, But Now & Forever SoTX

OK - - so you (or Moose) have a $12,300+ lens on your camera.
Not to mention a $500 Gitzo fluid gimbal head, and likely another $500 in the Tripod. ZOUNDS!!
What can the rest of us do for $595 - - Total ?? For me, its multi-shoot and pray.
Nice bird photo :) :)