Posts Tagged マッコウクジラ

Physeter Follow-Up

After I posted this photo of a sperm whale from Ogasawara to Flickr, I received a comment/ question from Rick Pearson.


Friendly sperm whale encountered west of Chichijima, Ogasawara
Photograph taken under permit

Here’s Rick’s comment:

Hey Tony, any more info about this particular whale? Is it a male (kinda hard to tell from this angle), and how big was it? I went to your blog page and didn’t find much more info there, just that it was very friendly. The reason I’m asking, is that the entire front, flattened portion of it’s head is gray, and there are lots of scars all over the head and around the mouth. I haven’t seen that much gray in any underwater sperm whale photo, and according to both scientists, and the old time Yankee whalers, that much gray on the front was most often found only on older, and therefore much larger, male sperm whales.

I certainly noticed the grey colouration right away when we came across this whale, largely because it made the whale easy to spot, but also, as Rick alludes to, most sperm whales don’t seem to have so much grey.

I wasn’t aware of any possible correlation with the whale’s age or sex, however.

Anyway, I promised Rick I’d find and post another photo of the same whale, showing the underside so we can at least decide if it’s a male or not, so here it is:


Sperm whale hanging in the water
Photograph taken under permit

And here’s a zoomed-in view of the genital area:


Close-up of the whale’s underside
Photograph taken under permit

The whale wasn’t very big, at least as far as sperm whales go. I’d estimate it was 12 metres long at most, and it didn’t have the bulk of a mature male. I’ve been in the water with two mature bull sperm whales, and believe me…when you see a big bull…you know it!

Anyway, the colouration is intriguing. If anyone else has any insights or relevant knowledge, please share!

Between The Lines

Photographing sperm whales can be a challenge for many reasons, including the fact that…well…they’re not always terribly photogenic. They often just look like big brown blubber logs with stubby fins, a tail and a mouth.


Making sperm whales look nice can be challenging.

Sometimes, you have to look between the lines…or in this instance, between the jaw lines…to see something interesting:


See the leftover squid arm? Note the big teeth too.

I have to confess that I didn’t notice the squid arm while I was in the water, since the whale passed by at relatively high speed. The swells were also considerable, which made framing the whale a challenge as well.

I can’t be 100% certain, but I suspect the leftover calamari segment was from an Architeuthis squid. From the above photo, it looks like the arm was attached to the whale’s face, perhaps as a result of the “teeth” on the squid’s suckers, which look like this (photo below from last year):

giant squid suckers

In October 2009, I recovered a 351cm segment of an Architeuthis arm from the water after we saw a sperm whale breach. I suspected at the time that the squid arm might have been attached to the whale and became dislodged when the cetacean breached.

This photo seems to offer some support for my conjecture.

Note: Photographs taken under permit.

Back From Ogasawara

I just got back from Ogasawara, where I was fortunate enough to spend some more time with sperm whales.

I’m not sure how much I’ll be able to write about the trip before I take off again in a few days, but here’s a sample image, taken during an encounter with a particularly inquisitive whale:


Friendly sperm whale encountered west of Chichijima, Ogasawara
Photograph taken under permit

Andrew and Scar

Most of the media coverage coming out of our recent trip to Dominica has centered around our host Andrew Armour’s relationship with Scar, the friendly male sperm whale that seems to seek out and enjoy human interaction.

I’ve received a number of emails, comments and other communication about Andrew and Scar…primarily reflecting two things: curiosity and concern.

It’s entirely natural to be curious. It’s not often that one comes across examples of sperm whales playing with people (or people playing with sperm whales for that matter).

It’s also natural to be concerned, since sperm whales are the largest living toothed animal on the planet.

andrew and scar

To augment the information in the media…

I have been in the water with sperm whales on three separate trips spanning six weeks or so in total duration. I’m certainly not as familiar with sperm whales as I am with humpback whales, but based on what I’ve seen, I think it’s reasonable for me to say that Scar is an unusual case.

Most sperm whales I’ve come across have been busy…feeding, procreating, travelling, socialising, resting…doing the things sperm whales normally do. As a consequence, most sperm whales are not in the habit of taking time to interact with people. There’s no benefit in it for them.

It is in this context that Scar is interesting. As I alluded to in an earlier post, Scar seems to play a lot…by himself, with the younger whales, and sometimes with people. He appears to play substantially more than the other adult/ sub-adult whales.

Watching Scar, I felt like he was sort of “in his own world”. It’s a difficult thing to pinpoint, but he didn’t seem to behave or interact in the same manner as the other whales in his group. He often seemed to be doing his own thing, such as rolling around in circles by himself while other whales rested together in a group.

This is pure speculation on my part, but if Scar were human, I would guess that he has a mild case of autism or something similar. It could, of course, just be his personality. I don’t think there’s any way to be certain.

In any case, adult male sperm whales usually leave family groups and head off to higher latitudes in the northern hemisphere (and lower latitudes in the case of the southern hemisphere) to lead mostly solitary lives until they’re ready for breeding.

Scar is overdue for a life of independence. At around ten years of age, Scar is mature enough to have left the area by now. Since he hasn’t done so yet, it’s reasonable to expect him to do so soon.

Of course, it’s possible that Scar somehow chooses to remain in the waters around Dominica, in which case…he’ll be really unusual. Time will tell.

Scar

Andrew Armour, who was our guide during the trip, has known Scar since the whale was a baby, having first come across him when the whale was injured at a very young age. Scar has apparently approached boats from the time he was a little leviathan and allowed people to pet him.

Sensible people would argue that it’s not wise to make physical contact with a large carnivore in the water. I would normally agree. I must admit a significant degree of concern and scepticism when I initially heard about Andrew and Scar.

But after seeing Scar for myself, and seeing how much he seems to enjoy human interaction, my scepticism and concern is significantly moderated. Scar approached all of us, and would not let us get away without stroking him. He closed his eyes and wriggled with delight upon contact (yes, I know that’s ascribing human characteristics to a whale, but picture a puppy squirming with enthusiasm and you’ll get the idea).

It was an amazing experience. Once again, I find myself struggling to convey an experience for which words are simply inadequate.

I would never recommend anyone rush off to try to pet any animal underwater. In fact, I would advise against anything of the sort.

But I also recognise that life is not black-and-white, and that exceptions to rules are often the most interesting things we come across.

Andrew’s relationship with Scar is real. Or perhaps more accurately, Scar’s penchant for human contact is real.

Note: Photographs taken under permit.

Bubbles

Still on the road…long journey back to Asia with a couple of stops along the way.

Still sleep-deprived, hence inarticulate.

Just felt like posting this photo of a sperm whale blowing bubbles. This happened toward the end of one of our encounters.

sperm whale blowing bubbles

Note: Photo taken under permit.

Story About Scar

We’re packed up and getting ready to leave Dominica. It’s been a fantastic first trip to this lovely island nation, and I’m looking forward to visiting again.

Before I head out, I thought I’d share a story about Scar, a male sperm whale that seems to seek out and enjoy human company. He’s the whale featured in the recent newspaper articles from our trip.

I was fortunate enough to watch Scar interact with his fellow cetaceans when there was no one else in the water (read…during a couple of exhausting, prolonged swims).

Scar seems to enjoy playing, whether humans are involved or not.

I watched Scar play alone…twirling in circles, doing loops, hanging upside down…while other whales in his group seemed to be busy doing other stuff. I also noticed that Scar seems to be the favourite uncle or older brother for the two calfs that were in his group.

Here’s a photo of the two calfs swimming along with Scar:

scar with two juvenile whales

I took this photo after witnessing an entertaining and memorable scene.

There are a few sperm whale researchers here at the moment, led by Hal Whitehead. During one of my prolonged swims with Scar, I saw the sonar array that they were towing behind their vessel, at a depth of around 20 to 25 metres.

Scar saw it too, and he swam down to take a look, eventually taking the the sonar array into his mouth for a taste test (I guess that’s the logical thing to do if you’re a sperm whale).

The two kids were swimming separately, but they must have noticed Scar having a good time, and they swam over, looked down at Scar, stopped to consider what Scar was doing, then rushed down to join in the fun.

Here are the two youngsters moments before they decide to crash uncle Scar’s party:

sperm whales with hydrophone

I laughed just enough to swallow a bit of seawater.

While we’re on the topic of sound, this is a short sample of sperm whale sonar communication, which we picked up on our boat’s hydrophone:

The most prominent clicks are from an adult male. There are other, more faint clicks in the background that are from females and/ or juveniles.

Off to the airport.

Note: Photos taken under permit.

Head or Tails?

We had amazing encounters yesterday with a family of resident whales called the Group of Seven.

Among the group were a couple of relatively large calfs, both of which were inquisitive and friendly.

At times, it was almost as if they presented themselves for photos (of course, at other times, we had to swim like mad just to keep up).

In case you ever wondered what a sperm whale looks like head-on, here’s a photo:

head-on view of sperm whale

The lump at the top right (actually, the whale’s top left) is the blowhole, which is how the whale breathes. The pointy area at the bottom is the animal’s mouth. The attached remora and small school of attendant fish are optional accessories.

The splotchiness (is that a word?) is due sloughing off of dead skin. The darker patches are older skin, and the lighter patches are newer areas.

And to keep things in balance, here’s the view from the rear:

rear view of sperm whale

Attached remoras again optional.

Note: Photos taken under permit.

All In The Family

Photographing open-ocean cetaceans can involve a lot of swimming.

For instance, to be accepted into this group of sperm whales required what seemed like hours of swimming as hard and fast as I could. In reality, it was probably only 10 minutes, give or take, but swimming for 10 minutes in ocean swell with the objective of catching up to and overtaking a group of whales is exhausting…especially if you keep doing it over and over again.

But on those occasions when whales slow down just enough to let me swim side-by-side with them for a while…it’s well worth the effort.

family of sperm whales

Note: Photo taken under permit.

More Than A Mouthful

While we’re on the subject of big mouths from my previous post, here’s a shot of one whale mouthing another during a period of intense social interaction:

sperm whale mouthing another whale

This playful mouthing seems to be a normal and frequent behaviour, as we’ve seen it many times in the social groups.

It doesn’t seem to involve aggression, and there doesn’t appear to be any serious force involved…sort of reminiscent of the way puppies in a litter play-bite one another…but more gentle.

Note: Photo taken under permit.

Say Ahhhhh

A couple of days ago, a large bull whale showed up to socialise with some of the younger males. Adult male sperm whales are huge.

In the water, it looked somewhere on the order of two to three times the size of the sub-adults, as well as being significantly greater in girth. They can grow to something on the order of 18 metres in length.

Of course, the pace of swimming was generally more rapid when the large adult was around, so it was difficult to keep up. After one extended swim, the whales took a right turn, giving me chance to close some distance…and this is what I saw:

large adult male sperm whale

The bull opened its mouth really wide, as if stretching its jaws. There was no aggression involved, and no sonar beyond the normal background chatter.

It was…to say the least…an impressive sight.

Note: Photo taken under permit.

Baby Sperm Whale

We came across a baby sperm whale today, a fairly young one from the looks of it.

I’m tempted to say that the image below is a photograph of mother and calf, but it’s difficult to tell with sperm whales, as they practice communal care of young.

baby sperm whale

Note: The baby is swimming upside-down.

Female sperm whales help one another to look after babies, going so far as to practice communal nursing. I saw this baby nurse a few times with one of the adult females, but still…there’s no easy way to be completely certain of whether it was the baby’s mother or not.

In fact, I saw the baby “switch” adults a few times too, moving from one large whale to another as the group swam along.

The baby was part of an extended family group of whales that we stayed with for a couple of hours or so. I’m not sure how many whales were in the group, but the most I saw at any one time underwater was 13 adults plus the baby.

The following photo shows the baby with seven other whales.

baby sperm whale and adults

Note: Photographs taken under permit.

Heads Up!

Actually…heads down. This is from one of our earliest encounters, with a group of four whales.

When sperm whales socialise, they often bump and rub against each other, and also put their heads together.

four whales

Note: Photo taken under permit.