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Maevatiana N. Ratsimbazafindranahaka

@rmaevatiana.bsky.social

330 followers 270 following 38 posts

Postdoctoral Researcher, @MPI_animalbehav | Alexander von Humboldt Fellow | Bioacoustics 🎶 Biologging 📈 Ethology 🧠, 🌊 🌍 He/Him

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · Apr 25

🐋 Moms float different 🐋
In our new @jexpbiol.bsky.social paper, we explore buoyancy control in humpback whales. Mothers seem to actively manage it; calves don't.
#MarMam

journals.biologists.com/jeb/article-...

Behavioral data suggest adaptive buoyancy control during shallow dives in humpback whales

Highlighted Article: Behavioral data from multi-sensor tags on humpback whale mothers and calves suggest that adults actively adjust their buoyancy during shallow dives. One potential mechanism underl...

journals.biologists.com

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · 5d

I’m sorry. My Bluesky profile is meant to be mostly about science. But I have to speak up: my country is not okay. We are being ignored, both internationally and by our own authorities. The violence is real, and the world must see this. #Madagascar #GenZ

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · 5d

I love the contrast between the images and the words of the president’s special adviser in this interview. And he’s quoting de Gaulle to say the president won’t step down; in a former French colony, led by a president with French nationality. The irony. #FreeMadagascar

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Reposted by Maevatiana N. Ratsimbazafindranahaka

Union Communiste Libertaire 37 @ucl37.bsky.social · 10d

Si un·e camarade sur place ou qui connaît bien #Madagascar veut proposer un article/itw pour #AlternativeLibertaire en 6k ou 12k signe (si possible avec illu) : [email protected] + [email protected]
@rmaevatiana.bsky.social @nil-rahola.bsky.social

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · 10d

4/4
We are not okay.
We are not being heard.
The world must see this.

#Freedom #SOS #ListenToMadagascar

Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · 10d

3/4
This is a desperate call for attention. Please, amplify.
Authorities will try to justify themselves, especially for international eyes.

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · 10d

2/4
Videos even show security forces standing by as chaos unfolded.
Was this deliberate?
To tarnish the movement’s image and justify more repression?

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · 10d

1/4
Hard to ignore how much “law enforcement” is deployed in the mornings in front of peaceful protesters in #Madagascar. Tear gas launched within minutes, even armored vehicles on site.

But then, come evening, when looting breaks out, they vanish.

#LeoDelestage #GenZ

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · 13d

Law enforcement deployed in Madagascar under the excuse of stopping a “minority seeking chaos.”
Tear gas & gun in the streets. Pure intimidation.
People are tired of power cuts, no water, corruption, and insecurity, all from failed governance.
Nothing is fine. The world must know.
#Leodelestage

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · Jul 18

I’ll be at the International Primatological Society Congress in Tana in a few days! 🐒
Happy to chat with anyone who's around. Come say hi! 😄

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Reposted by Maevatiana N. Ratsimbazafindranahaka

Zoë Goldsborough @zoegoldsborough.bsky.social · May 19

Hot off the press 📣: one of the most surprising and unsettling findings of my PhD. A novel social tradition emerged in the tool-using white-faced capuchins of Jicarón island… abducting and carrying the infants of another species. Thread with gifs, videos, and all the bizarre details 👇

Ecology of Animal Societies @livingingroups.bsky.social · May 19

Humans have many unusual traditions. But did you know animals’ strange behaviors can become culture too? Out now in Current Biology (doi.org/10.1016/j.cu...) we show the rise and spread of a surprising tradition: interspecies infant abduction. Interactive timeline (www.ab.mpg.de/671374) 🧵 (1/12)

An illustration of a white-faced capuchin monkey carrying a howler infant on their back while cracking nuts with a stone

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Reposted by Maevatiana N. Ratsimbazafindranahaka

Pranav Minasandra @pminasandra.bsky.social · May 16

🚨 Out this week in @pnas.org 🚨
The flagship paper from my PhD @mpi-animalbehav.bsky.social @livingingroups.bsky.social - We show surprising statistical similarities in animal behaviour across states, individuals, and even species.
www.pnas.org/doi/10.1073/...
(🧵 1/10)

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · May 1

#MarMam #animalcommunication

Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · May 1

(7/7) Made possible thanks to:
#cetamada @bioacteam.bsky.social #UPSaclay #NeuroPSI #CNRS #UnivTana #MZBA

#HumpbackWhale #MarineScience #AnimalBehavior #3DTracking #WhaleResearch #MovementEcology #SciComm

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · May 1

(6/7) Curious about humpback whale nursing behavior?
Check out our published work:
🔗 peerj.com/articles/129...
🔗 link.springer.com/article/10.1...
🔗 royalsocietypublishing.org/doi/abs/10.1...

Characterizing the suckling behavior by video and 3D-accelerometry in humpback whale calves on a breeding ground

Getting maternal milk through nursing is vital for all newborn mammals. Despite its importance, nursing has been poorly documented in humpback whales (Megaptera novaeangliae). Nursing is difficult to ...

peerj.com

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · May 1

(5/7)🎥 The video plays at 5× speed, except for the nursing moment, which is in real time.
▶️ Also watch it here:
🔗https://youtu.be/Fyw6UUvNrf4

What if we could zoom out and see the whole scene? | 3D Humpback Whale Nursing Behavior

YouTube video by Maevatiana Nokoloina Ratsimbazafindranahaka

youtu.be

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · May 1

(4/7) It’s not perfect. Due to noise and some approximations, the individuals can look shaky or like they bump into each other. But it's all based on real data, and gives an amazing glimpse into their world.

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · May 1

(3/7) Using @blender3d.bsky.social, we turned the sensor data into a full 3D animation.
The calf turns blue while suckling 💙
See what happens before, during, and after nursing, like a drone view underwater. But no drone. No divers. (We would not be able to keep up with a diving whale anyway!)

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · May 1

(2/7) In this video, both mother and calf were tagged with sensors:
📦 accelerometer
🧲 magnetometer
🌊 pressure sensor
No camera needed.
We used their movement data to reconstruct their 3D paths during nursing off Sainte Marie, Madagascar.

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Maevatiana N. Ratsimbazafindranahaka @rmaevatiana.bsky.social · May 1

(1/7) 🐋 Remember those humpback calf-perspective videos I used to share? Super cool, but they only showed what the calf’s camera could catch.
What if we could zoom out and see the whole scene?

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Reposted by Maevatiana N. Ratsimbazafindranahaka

Journal of Experimental Biology @jexpbiol.bsky.social · Apr 29

Most diving mammals must work against their buoyancy until they reach a depth where they are neutrally buoyant, but not adult baleen whales. They use their laryngeal sac filled with air to adjust their buoyancy to remain suspended effortlessly at any depth
journals.biologists.com/jeb/article/...