Category: Whale Mom and Calf

August #1 2022 – How do Whales Nurse Their Babies?

More Moms with calves are showing up here in the Salish Sea this season – 6 pairs sighted so far. Judging by their playful acrobatics and assertive blows the young ones are thriving. The mothers seem to be in good shape as well considering they lose 1/3 of their body weight during the >10,000km (6,000 mile) round trip migrations to Mexico, Central America or Hawaii and back. Add in the previous 4 months of nursing her hungry baby and it’s no surprise that a mother whale’s prime directive once she reaches the feeding waters is to feed.

“It’s Big Mama” “And she’s got a calf!”  Terry is jubilant. Big Mama is one of the whales we have met several times during the years we’ve been on the water. She is a prolific mother and veteran of the humpback comeback to the Salish Sea. Big Mama was the first whale to return to these waters in 1997. Since then she has brought each of her new calves back with her.

Big Mama and her new baby are accompanied by another adult whale. We couldn’t tell who it was because we couldn’t see the whale’s flukes or whether (s)he was female or male. If the companion whale migrated together with Big Mama and her calf from their southern mating/birthing area then this whale is probably a male who is interested in Big Mama as a potential mate. This “escort” can be an asset to Big Mama and her calf if a pod of killer whales attempts an attack on the young one as he will protect the calf with Big Mama. However, he can also be a nuisance if he attempts to mate with her and interferes with nursing.

Mother humpback whales nurse their babies for the first year even though the baby is already learning to fish as soon as she reaches the feeding area. The baby thrives on mother’s rich milk, which is between 45-60% fat  How do whales (and dolphins) nurse in their underwater environment? Terrestrial mammals like humans have nipples which are exposed and easy to suckle. But the mammary glands of cetaceans (whales and dolphins) are concealed inside 2 slits on either side of their genital slit low on the abdomen. The nipples are inverted inside these mammary slits. A whale calf must dive underneath the mother and nudge the mammary slits with her rostrum to release the nipple from the slit. Whale calves might be able to roll their tongues into a tube shape and press their rolled tongue around the nipple to channel milk. The mother could then squirt milk into the calf’s mouth using muscles around her mammary glands. Because of the high fat content the consistency of Mom’s milk is thick and doesn’t easily dissolve in water if some leaks out.

Mom and calf stay in close physical contact in the first months of the baby’s life. So much of what transpires between moms and babies is speculation because it happens underwater out of our visual range. Their vocal communication also happens outside of our human hearing range. Mother and baby communicate through touch and very quiet low frequency grunts, barks and groans. They “whisper”  so their sounds don’t attract killer whales. Because these “whispers” are so quiet Jude can only pick up a signal on her hydrophone within about 200m of the whales. However, since the whale whispers are too low for humans to hear it’s impossible in realtime to know whether any whale conversations are actually occurring. This can be very frustrating! It is only after recording in the vicinity of whales and afterwards importing the recordings into a software program called a spectograph which translates the sound waves into a visual representation that we can see whether we recorded something. It’s also possible to speed up the slow low frequency sound waves 2 or 3 times within the program so they can be heard in our human hearing range. Unfortunately there is no room in Blue P’s small cockpit for any more audiovisual or computer equipment and no budget for expensive hardware and software. All this has to be done later on our home system.

We learn that the whales are communicating all the time, which is obvious with any amount of time observing their interactions. In the plankton filled waters of the summer Salish Sea it is vibration and sound that carry myriad whale messages through the water. Once on the feeding grounds Big Mama and her calf may associate with various other whales through the season and even during one day. We watch them form a group, separate for a while and come back together obviously communicating with each other. Since all Big Mama’s children return to their mother’s feeding area some of these whale companions may be the new calf’s older brothers and sisters.  So many intriguing questions…….

 

July 2020 #5 – Playtime with Spotlight & Calf!

We moored Blue Parrot on the dock with her nose toward shore. At low tide with a NW wind blowing us towards moored boats in shallow water it’s a bit tricky getting off. We time for a gust to blow Blue P off the dock and pull a 270° turn to head out into Evans Bay. The NW wind sweeps across low terrain on Read Island from Hoskyns Channel, Johnson Strait and Bute Inlet. White caps on the crests of short steep waves rile up the mouth of the bay. Wind and waves blow us around the point all the way into Burdwood Bay.

Baby Breaching!

Terry assesses the possibility of an anchorage for later tonight. “Looks good at low tide here. I think we’ll be OK. Let’s head out.” Blue P angles across the frothing mouth of Evans Bay to the Penn Islands. We’re getting ready to raise the sails when the water suddenly flattens and the wind dies. “Typical” Jude mutters as another attempt to sail is foiled yet again.

All thoughts of sailing evaporate as we spot 2 humpies close to the shore of the middle Penn. They’re moving slowly, making their way around the outside island closest to Cortes. “Sleeping” Terry notes wryly. He notices one of the whale watching boats emerging from Whale Passage and reports the whales. We decide to move a little closer when “What was that? Up ahead – a breach – towards Von Donnop” We hear the WHHOOMP of WHALE hitting Water.  “Let’s Go!” Jude steers Blue P over as the whale watchers speed past.

We approach slowly and cut the engine “Is that a baby?” Terry wonders “Yes! A Mom and Calf! Look! The baby is breaching – she can’t quite make it all the way out of the water” —–“Is this a good position?” Jude calls to Terry who is perched precariously on Blue P’s bow manouvering carefully around the furled jib.

“WHOAH!” Mom is tail lobbing. Half her body is up out of the water. Baby is so close it looks as if Mom is going to land on top of herm – but she doesn’t. “Looks like they’re playing” Terry shouts during a brief lull in activity. He’s performing some fancy footwork to keep the whales in focus as they circle around Blue P at about 100 meters. Their play is so exuberant and Baby’s ingenue breaches are so adorable. Then Mom BREACHES – WHHHHUUMMMPPPP!  The SIZE of HER!! There are no words equal to the AWESOMENESS of a 40 TON WHALE leaping clear out of the ocean into the air. “Sky Hopping” as our friend Martha thought it was called – A much better description of defying gravity!

So special to finally witness a Mom and Calf playing together like this. We are so juiced! We’ve waited 5 years for this moment – and to capture it on film so we can share it with you was worth every minute of boredom and discomfort.

Mom and Calf are moving north. They’re getting farther away as the wind blows Blue P south. Then “Looks like playtime is over. They seem to be resting now”.  Terry observes. “Heads up!” Jude calls. She swings Blue P around in the direction of a nearby cove where half a dozen boats are congregating. “There are a couple of whales over there. Maybe they’ve finished sleeping” We hang around with them for a while but they’re not interested in people. They dive and easily give us all the slip.

Meanwhile it’s getting pretty windy so we decide to head back towards our evening anchorage. Evans Bay has once again erupted in white caps and heavy winds. We angle across the waves, navigating around another whale who is also crossing. “Happy sailing friend”

There are 2 other sailboats already anchored in Burdwood Bay so anchoring is a bit tight. But it’s protected from the NW waves and the gusts will blow us off shore not towards the other boats, so we settle in for the night.