The calf who circles the boat
Nan Hauser (Guest) · 14:24
So many. I think the one that really blows my mind the, the most is their whole migration, navigation And when we started satellite tagging whales and watched where they were going and how we were going, we thought that the whole Argos satellite system must be a bit wonky because they were making these funny, like really angled turns. And looking at it more closely, we found that they're following these linear constant course segments. And they're not deviating. I mean, they won't even deviate by a degree. If I put my boat in front of them when they're leaving Rarotonga, they'll go under my boat. And so they can be very accurate within that 1 degree. And they follow these until the declination and the inclination of the moon and gravity and the sun, and they make this angled turn at 23.439 degrees. And multiples of that. And if you go back to your childhood, you might remember that is the Earth's axis. It's the position between the sun and the moon. So they're using this celestial navigation and it's perfect. And we don't know how, whether it's in the cells, whether where the magnetite exactly is. And yeah, fascinating. That they are so good at navigation. And, you know, of course they make mistakes, and there are some areas where the magnetic pull is crazy, so they get lost sometimes and they strand sometimes. But to swim as far as they go— I mean, in a lifetime they swim to the moon and back, and some people say maybe even twice.
Natalie Stockdale (Host) · 16:24
Hmm. Let's talk about the strandings, Nan. What do you— how do you make sense of the strandings? Is human intervention a part of it? That our human intervention disturbs their natural tracking systems?
Nan Hauser (Guest) · 16:41
Absolutely. It's hard to know exactly I mean, noise pollution obviously really affects them. And especially when mid-frequency sonar, the 242 decibels at 53 Charlie, that really affects whales, especially the deep diving whales like beaked whales. And so actually we're talking about in the Cook Islands, we are creating what we're calling To'ora, we call it a whale raui. And raui is when you close an area in the lagoon for a while to make sure that everything stays healthy and sustainable. And now we want to create an offshore raui using the satellite tagging, because now we know where they go. And if we can prevent fishing, if we can prevent ship strikes, if we can prevent noise, then they have a much better chance of making a successful migration.
Natalie Stockdale (Host) · 17:51
Nan, what are the main threats facing whales at the moment, you know, globally? Because I think there's a lot of— well, certainly I and a lot of Australians have this sense that whales are saved now, that the harpooning, the hunting, is over, thankfully. And population— the humpback populations are growing, so there's nothing to worry about anymore. But is that the case, or are whales still at risk? You've already touched on some.
Nan Hauser (Guest) · 18:19
Well, yeah, they're still at risk, but in, in Australia, you've got a really good success story going on there with your whales. They are increasing in numbers, and especially calves, and that's so important. But our whales did not recover like your whales did. And a lot of that has to do with the illegal Soviet whaling that went on from 1947 to the late '70s. I mean, they killed millions of whales. So we haven't recovered yet.
Natalie Stockdale (Host) · 18:57
And what's going on in the Middle East with whales?
Nan Hauser (Guest) · 19:00
Oh, there's a population in Oman And there are very few left, actually. I don't know what the exact number is today, but they're going to become extinct, I'm sure, that population. And it's interesting that they don't migrate anymore. They just stay in that area. But it's so sad. It's kind of like the vaquita in Mexico. We only have 10 left, although I got a post today that someone saw a calf, so we might have 11.
Natalie Stockdale (Host) · 19:34
Gosh. So it's mainly humpback whales that you research, and your PhD is based on humpback whales. Can you tell us a little bit about your research, your PhD?
Nan Hauser (Guest) · 19:46
Yes, and it was hard for me because I'm so interested in absolutely everything. And so I don't want to just to population abundance or whatever. So I— well, the paper itself I call Endangered Humpback Whales of the Cook Islands: Long-Term Monitoring, Migratory Connectivity, and Conservation Pathways in Oceania. And it's about where our whales travel, where we have resighted them before, whether it be through genetics or photographs Or, well, Happy Whale. I should talk about Happy Whale because Happy Whale has made it all so much more interesting. Happy Whale is a website where this wonderful friend has started a site where everybody around the world can send their tail flukes in of humpback whales because that's how we ID them. On the ventral side of their tail fluke. So now we know even more. So that's what my paper is about. A lot of photo ID and then using Happy Whale to make matches, which has been phenomenal. And population abundance and depth of mothers and calves and singers and how many whales and how much effort and all that kind of stuff. So yeah, but I have written other papers on other species, which, because I'm fascinated by them all, but humpbacks are just really acrobatic and entertaining and fun.
Natalie Stockdale (Host) · 21:31
Yes, yes, and engaging. I imagine you— do you find them engaging?
Nan Hauser (Guest) · 21:37
Oh my God, yes, they have incredible personalities actually.
Natalie Stockdale (Host) · 21:42
When we previously spoke, you mentioned that you've observed a sense of humour.
Nan Hauser (Guest) · 21:45
Can you tell us about that?
Natalie Stockdale (Host) · 21:47
Whales' sense of humour.
Nan Hauser (Guest) · 21:49
Yep, they certainly do. At least humpbacks certainly have a sense of humour. They kind of goof on you once in a while. If I'm underwater, and especially the juvenile males, when they swim past you, they will take their tail and phew. And there was a time, oh gosh, this was this calf named Hawa. She was a newborn calf and her mom didn't want her to be around us, but she was very tired. The mother would go down and sleep for a good 20 minutes and Hawa had to come up more often to take a breath because their lungs are much smaller. And so she'd come up and circle the boat and circle the boat and look at us and keep looking at the boat and then She'd go back down and then she'd come back up again. But if mom woke up and she came up to the calf, it was just like, "Oh no, I'm in trouble. I'm in trouble." And she'd start acting out and showing off and doing all kinds of things that a toddler would do.
Natalie Stockdale (Host) · 22:52
Yeah. It's fun. Yeah. Gorgeous.
Nan Hauser (Guest) · 22:56
Yeah. And every once in a while, you also get a big splash. They're traveling alongside with you. I let them follow me. I don't really follow them. They come alongside me and then they'll just once in a while take their tail fluke and turn to you.
Natalie Stockdale (Host) · 23:13
Right. And then you mentioned that they sometimes bump your boat. Yes. Wow. I haven't experienced that before.
Nan Hauser (Guest) · 23:22
Oh my gosh. It was 1999, I think. And This whale, it was a mother calf and escort, although I didn't know it was the mother at the time. She approaches the boat. It was a fiberglass boat. It was 22 feet long, but it was pretty heavy. It was from Nova Scotia, but I had it in the Cook Islands. And she comes and she hits the boat, lifts us up like this. We literally slide down her back. It's all on film. Slide down her back. And I was sitting on the top and almost fell off. And then she twists around and comes back again and went underneath the boat and then lifts up her tail and it was pure black. And we don't really have pure black flukes. It's very rare. We do in the Northern Hemisphere, but not in the Southern Hemisphere. They're very white with, and some have black and white on them. And we kind of went, "Oh!" And I was so curious about it. So just let her calm down a little bit, slipped in the water, and it was amazing what she did. You know, anybody, well, you'd think any species would be a little bit angry and she wasn't. She basically said, "Okay, will you babysit for my calf while I go have sex with this male?" And she left the calf right there. She left the calf with us and she went off for like 10 minutes. You could see her splashing away about a kilometer away. And then she came back and then she went off again. And I felt like, okay, she just wants me to babysit. The calf was acting out a bit and had some gastroesophageal reflux and was vomiting a little. Milk and so unpredictable. Their behavior is really interesting.
Natalie Stockdale (Host) · 25:24
Gosh. So do you think the bumping of your boat was aggression or just she wanted your attention for your babysitting role?