But the nature guide's latest interaction on Tasmania's east coast has left him devastated.
He along with two of his colleagues had travelled by boat to Bryans Beach, not far from the popular tourist destination of Wineglass Bay.
It was there they came across more than two dozen pilot whales lying in the shallows on Wednesday morning.
All of them were dead.
"It was pretty heart-wrenching," Mr Theobald said.
"The fact that there was just so many of this species right in front of me and I was walking [past] even small calves was pretty confronting."
Another tour operator, Rob Pennicott, said it was his son who first discovered the stranding after seeing one of the carcasses floating in the water on Tuesday.
"My son Noah sent me photos and reported it to Marine [and] Safety Tasmania because the first whale he saw was actually floating and was a hazard to shipping and boats," Mr Pennicott told ABC Radio Hobart.
"And then he saw on the beach the devastating [scene] of over 30 dead whales on the beach.

Tasmania's Natural Resources and Environment Department said 34 carcasses had been found along the southern tip of the Freycinet Peninsula.
"Staff, including a wildlife veterinarian, are on site today to assess the situation and sample and measure the carcasses," a spokesperson said on Wednesday.
Reason for mass stranding remains a mystery
Whale strandings are not uncommon in Tasmania.
In September last year, more than 200 pilot whales became beached near Macquarie Harbour on Tasmania's west coast.
The mass stranding occurred almost two years to the day after a separate event in the same area, when more than 400 whales became stranded.
Mr Theobald said he filmed and photographed the carcasses at Bryans Beach to highlight the scale of the latest incident.
"I just wanted to show the human interaction that we do have with animals and just show the scale of the phenomenon that happened out there."
While he acknowledged it was difficult to pinpoint the reason for whale strandings, he said he was concerned that human-related activity could be a contributing factor.
The department's spokesperson said: "It is not known why the whales stranded and is often not possible to determine."
They urged members of the public to keep their distance and report stranded whales or dolphins to the whale hotline on 0427 WHALES (0427 942 537).




Reader Comments
Gary Zukav, Seat of the Soul, had a beautiful write-up on its purpose decades ago.
The dolphin soul has been suiciding itself for decades purposefully, stranding themselves, the loss of hope in humanity's creative process is its cause... we are destroyers.
I am getting tired and life is not enjoyable anymore when we are pushed to our limits. Just saying,
Holy F!! Your body has attracted that regardless of the reasons. It can be disengaged by a proper process. All I can add is firstly, the instrument must be cleaned (my below addition, nobody else's!).
2ndly, if I were you, I'd reach out to Laurel Sanders, (I've worked with her at The Canyons UT Personal Intensive July 2006) and she would be my only GO-TO person for any important body work).
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I'm adding a bonus prayer keep watchful ok.
2-3/daily COD Liver Oil
NO running❣️❣️ Walk in Sun n breathe down to the 👣👣👣👣SAUERKRAUT, salt-based!!
1 daily cup + 1 daily 🍎 1st month add small garlic toe, chewed or swallowed.
PH Balance is KEY to perfect HEALTH; GUT 'clean-out' clears anything n all UP⬆️
DIY LactoFermentation 101
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And daily warm-up
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Reread my Cappy info.
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For humans :
This may include neurological symptoms such as blurred vision, lightheadedness, vibratory sensations in hands, arms and legs, and tremors in upper extremities, slow frequency sonar is that of disorientation due to vestibular stimulation.
There are no noise-cancelling headphones to stop the U.S. Navy's 235-decibel pressure waves of unbearable pinging and metallic shrieking. At 200 Db, the vibrations can rupture your lungs, and above 210 Db, the lethal noise can bore straight through your brain until it hemorrhages that delicate tissue.
Then you would know how I feel when they use different frequencies on me. How it disrupts my body from head to toe or on any one area.
Sound waves from military submarine sonar systems can get as loud as 235 decibels. They are able to travel hundreds of miles and can maintain the intensity of 140 decibels as far as 300 miles from the source. Cargo Ships create what is known as ambient noise.
This is why they beach themselves and when people rescue them put them back in the open sea they will re-beach themselves agin to get away from the frequencies.
Con.Spirit.acy is always at play, it is secret, it is sacred. Evolution is the only way and is willed into being all around us all the time, there is no place where it cannot be. Yes, it is deep knowing, intention of Nature, collateral damage is a thing, become a very exaggerated thing because do not do their best. The animal kingdom, the plant people, the stones and the waters are reflections of each of us.
What we give focus to expands and ripples, out and inwards. Conflict is giving credance to duality. Any instrument can only perform optimally if optimally cared for.
Resonance is a frequency and the magnet.
The Dophin Soul is no different. Exaggerated distortions rip the web apart and things go extinct. Like families....
I don't focus on that other crap. I experienced way too much of beastly behaviour since 2008. I love myself too much to stoop low.
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The Healing Code by Alexander Loyd PhD ND $8.24 on Amazon paperback
Quantum - Touch 2.0 The New Human by Richard Gordon paperback
I started off with the healing code it explained how to feel and use the eather energies, if one can feel these energies they can be little to very intense, this is the eather energies being felt going through one hands and fingers.
The Quantum Touch is the second book to read to use the energy that was learned from the Healing Code to learn how to run the energies using the third eye, charkas, hands an fingers to direct it to heal yourself and others from up close to far away even across the ocean. It works.
These are or were some of my gifs that I was born with to wake up to at some point in my life. The sad part for me is they burned out my pineal gland and fucked up my field with their microwaves and wifi attacks. This was after the black choppers made a visit to me and then the ship or craft that came did their experiments . I can still help people learn the way to heal physically that Dr.s and surgeons can't. All of this is for the most part using the N.Teslas ( Energy, Frequencies, Vibration ) formula. I did not realize I was using his formula for years before I read about some of this works in the Quantum realm.
(I know why I am pulled towards certain individuals).
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From my back window I see an industry shoot steam thru their chimneys at night, I know snow (or in the summer, rain) starts falling next 8 hours....
Here Patrick, she is fun n savy. I listened to her first audios 3 decades ago.
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And a Dr Berg
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I agree with the autoimmune video as I use to eat and make sauerkraut and take the same supplements, I still eat store bought kraut maybe once a month and I use some vitamins every few days. They would steal my vitamins and that got very expensive, so I don't take what I need because of that. Everyone has there situations to deal with for sure.
2nd, don't waste your $. Sauerkraut with apple n garlic D.A.I.L.Y. and Cod Liver Oil with that exercise routine (I have 1 other but that can wait) is all you need to get them off of yer ass n rebuild your body. I say this with conviction and btw what you heal this time around you won't need to revisit NEXT time around. LIFE is but a play about SELF-DIGNITY.
(cough cough )
Next time around it'll be up-shifted by a few notches most probably.