Skip to content

Notes on the Insane Biology of Dragonflies

What can we learn from the incredible biology of dragonflies?

Bram Adams
Bram Adams
1 min read
Notes on the Insane Biology of Dragonflies

Table of Contents

 https://www.youtube.com/watch?v=iJi61NAIsjs&ab_channel=RealScience
 00:59

most animals succeed at the hunt <60% of the time

 02:48

a dragonfly is an odonate -- extinct ones had 70cm wingspans

 04:13

dragonflies have muscles that directly connect to their wings

 05:20

phased stroking is used for forward flight -- at 50km/h

 06:12

dragonflies can fly backwards

 07:15

pterostigma acts as a counterweight to flight

 09:30

can see orange to ultraviolet

 10:30

fly close to water for higher contrast for prey against a blue sky

 11:35

dragonflies play tracking to predict prey

 13:02

humans can learn interoception ^d31494

 14:37

less oxygen, smaller animals

 15:06

dinosaurs may have outcompeted larger dragonflies


On Coal Forests

Huge dragonflies lived off of higher O2 air content

Coal forests were the vast swathes of wetlands that covered much of the Earth's tropical land areas during the late Carboniferous (Pennsylvanian) and Permian times.[1][2] As vegetable matter from these forests decayed, enormous deposits of peat accumulated, which later changed into coal.
Much of the carbon in the peat deposits produced by coal forests came from photosynthetic splitting of existing carbon dioxide, which released the accompanying split-off oxygen into the atmosphere. This process may have greatly increased the oxygen level, possibly as high as about 35%, making the air more easily breathable by animals with inefficient respiratory systems, as indicated by the size of Meganeura compared to modern dragonflies. (View Highlight)
https://bram-adams.ghost.io/content/images/2023/03/big-dragonfly-for-scale.png
big dragonfly for scale.png
youtube-notesbiology

Bram Adams

writer, programmer

Comments


Related Posts

Members Public

Notes on The History of Menswear

All about the history of menswear, from the Chinese ruling class wearing nail polish to the introduction of modern streetwear.

Notes on The History of Menswear
Members Public

Notes on OpenAI Q&A Finetuning GPT-3 Vs Semantic Search - Which to Use, When, and Why

A great video about finetuning vs semantic search. Finetuning teaches a model to write new patterns, not to have a theory of mind.

Members Public

I Programmed a YouTube Clipper

Just to capture this goated moment on a Kripp vid Are you on the guest list? x 3 It captures the current time from a YouTube share link and adds 5 seconds to the end time, subtracts 5 seconds from the start time. Get it here ⬇️ GitHub - bramses/ytclip-10s