Whales: Reality Versus Fiction

In Following Papa’s Song, by Gianna Marino, a curious whale calf named Little Blue prepares to migrate. “It is time?” Little Blue wonders. “Listen for the other whales,” Papa explains. “When you hear their call, we’ll know it’s time to go.” Later in the story, Little Blue wants to know about Papa’s call, asking, “When I am big, Papa, will I still hear your song?”

Papa replies: “Yes, Little Blue. If you listen closely, you will always hear my song.”

I choked up a little as I read that line to my six-year-old daughter, who is growing up so fast, as children always do, it seems.

Following Papa’s Song is a beautiful and poignant picture book that captures a special relationship between a father and his child. I wish I could leave it at that, but facts have an awful way of infecting my enjoyment of fiction, and as I was reading this book to my daughter, I kept thinking: Shouldn’t Papa really be Mama?

To find out, I read a couple of studies on baleen whales (which include blue whales). I learned that my hunch is probably right, but the answer might not be so simple. It turns out that we don’t know that much about the social dynamics, reproduction, or parenting of blue whales because their “oceanic tendencies and low numbers” make it difficult to study them (Lomac-MacNair & Smultea 2016). What we do know is that:

  • They tend to be solitary creatures, though they do sometimes form small groups;
  • We have only observed males produce songs; and
  • We have only observed females parenting calves.

So, in real life, a blue whale calf would probably have a relationship with their mother, not their father. However, what I’m wondering about now is how researchers identify the sex of the whale they’re observing.

I’m not a marine biologist, so perhaps this is a silly question, but it’s what came to mind as I read a couple of studies on the subject. A large portion of the information we know about whales seems to come from the gruesome whaling industry. I’m not sure what information they gathered, but they may have noted that whales killed with calves were typically female, a conclusion that is consistent with human gender stereotypes. Whatever the reason, modern observational research seems to assume that whenever two blue whales are together, and one is larger than the other, they are a mother-calf pair.

For example, in Reproductive Parameters of Eastern North Pacific Blue Whales Balaeonoptera musculus (linked below), the researchers explained their methodology like this:

Blue whales were individually identified using photos of the flanks and backs of both sides. Females were identified as cows (i.e. lactating) due to the presence of a calf, which in turn was identified by its relatively small size (half the size) and positioning in synchronous swimming pattern while accompanying the female during several consecutive surfacing sequences in the same sighting over approximately an hour.

That sounds reasonable. However, it’s worth noting that researchers in another study I read, one on humpback whales (also baleen whales), were surprised to learn that two of the whales they identified as female because they appeared to be with calves turned out to be genetically male (amusingly, the researchers punctuated this finding with an exclamation point!). (Barendse et al. 2013).

So, maybe a blue whale calf could follow their papa’s song? It doesn’t seem likely, but who knows what we’ll learn about this magnificent species in the future.

PS. My kids have been interested in blue whales ever since they saw the preserved blue whale heart in Toronto earlier this summer (they went with my sister and my Dad, who is standing with them in the picture). The heart is from a whale carcass that washed ashore in Newfoundland in 2014. To learn more about this exhibit, see Blue Whale (Royal Ontario Museum)  & The Painstaking Process of Preserving a 400-Pound Blue Whale Heart.

________________

Sources:

Barendse et al (2013) Mother Knows Best: Occurrence and Associations of Resighted Humpback Whales Suggest Maternally Derived Fidelity to a Southern Hemisphere Coastal Feeding Ground, PLOS ONE, available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3857176/pdf/pone.0081238.pdf

Lomac-MacNair & Smultea (2016), Blue Whale (Balaenoptera musculus) Behavior and Group Dynamics as Observed from an Aircraft off Southern California,  ANIMAL BEHAVIOR & COGNITION, available at: http://animalbehaviorandcognition.org/uploads/journals/9/01.Feb2016-Lomac&Smultea-final.443.del.pdf

MacDonald et al (2006), Biogeographic Characterisation of Blue Whale Song Worldwide: Using Song to Identify Populations, J. CETACEAN RES. MANAGE. 8(1): 55-65, available at: http://cetus.ucsd.edu/Publications/Publications/McDonaldJCRM2006.pdf

Sears et al (2013), Reproductive Parameters of Eastern North Pacific Blue Whales Balaeonoptera musculus, ENDANG SPECIES RES 22:23-31, available at: http://www.int-res.com/articles/esr2014/22/n022p023.pdf

 

 

15 thoughts on “Whales: Reality Versus Fiction

  1. I love this post. It really speaks to my scientist heart. This is the reason why I would love it if more children’s books by scientists were published and also if scientists were consulted for their expertise. It also shows the huge problem in ecology that is putting our expectations on other animals. There is one bird that has 4 different sexes and YET we say that they have one FEMALE and three MALE sexes.

    For example, in some children’s books otters are described as not being solitary, which is not true for the Eurasian otter in most regions. Also, children grow up thinking that there is only one otter species instead of THIRTEEN! On that note, where are all the otter children books! I need more.

    1. Have you ever considered writing a children’s book featuring otters? I didn’t know that the Eurasian otter is a solitary animal in most regions. Fascinating!

  2. Love! Whales are my favorite animals – I’ve adored them since my dad took me whale watching for the first time when I was six, like Z. In fact, the first gift Steve gave me was a humpback whale adoption (humpbacks are my all-time favorites). I always like seeing others interested in cetaceans!

    1. I would love to take the girls whale watching! That’s something we haven’t done. Do you remember what whales you saw on that trip? Steve’s first gift to you was so thoughtful. He’s definitely a keeper!

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