# sundayfishsketch history science dinosaurs evolution physiology obscuresharkthursday funfact toastysharks

tuna kick so much ass they have more myoblogin in their blood (why their flesh is red instead of white) and are some of the ONLY fish that have developed endothermy, which delivers more heat/oxygen to their muscles and lets them swim stupid fast

3 32
2022-01-04

Extremely sloppy
Sword fish and relatives have brain endothermy. Warmer brain and optic nerve benefit these organs when fish encounter steep thermal changes (e.g. deep dives). More in the paper by Wainwright and Longo https://t.co/FSxvC7xRnz

2 21
2020-10-05

shrinking and the evolution of in birds — the evolution of endothermy (thermoregulation by metabolic means) represents a major transition in vertebrate history
► https://t.co/mWFgUukKZI via

8 13
2020-01-21

From : "Shrinking and the evolution of endothermy in birds" https://t.co/Tcjao890nV

0 3
2020-01-21

Just published – Fires of Life: Endothermy in Birds and Mammals https://t.co/dvf4mBzjEE A fascinating read on the evolution of warm-bloodedness (or endothermy, as it is technically known)

3 2
2019-08-16

Did you know Porbeagle Sharks (Lamna nasus) can live in almost freezing waters?!

It's so cold humans would lose consciousness in <15 mins! These sharks survive by warming important parts of their body up, called regional endothermy!



©Doug Perrine

45 138
2019-05-16

Porbeagle sharks use a rete mirabile, or network of blood vessels exchanging heat, to create regional endothermy!

7 4
2017-02-07