Category: dolphin

the-cetacean: Common Dolphins (Dolphins: Spy …


Common Dolphins (Dolphins: Spy in the Pod)

Russia to ban capture of killer whales and bel…

Russia to ban capture of killer whales and belugas in 2019 – Whale prison in Russia:


Wonderful news. Let’s hope this is reinforced.



Check out that difference in dorsal fin size—an adult male killer whale’s dorsal fin can be up to 6 feet in height, while a female’s dorsal fin be half as tall at around 3 feet.

Surprisingly, we still do not know why this difference in fin size exists. Sexual selection is probably involved—females prefer to mate with large males over smaller ones. But is the tall dorsal fin a byproduct of increasing selection for larger overall body size? Or are females specifically choosing taller dorsal fins? If so, are there beneficial genes associated with a larger dorsal fin that a female might want for her offspring?

On the other hand, perhaps sexual selection isn’t involved at all—sexual dimorphism can be caused by differences in behavior or ecology among the sexes in species. Dorsal fins are used for balance, and in marine mammals, they are also used for thermoregulation. Any differences in behaviors or ecology relating to these factors in males and females could potentially drive changes in fin morphology.

Even seemingly simple questions like “Why is a male killer whale’s dorsal fin larger than a female’s?” can be surprisingly challenging to answer!



I am roughly 5 feet and 6 inches in height (~167 cm). If I stood on this male killer whale’s back, his dorsal fin would be taller than I am. Their size is often hard to grasp; even when you see them in person, it’s still difficult to gauge how large they are until they make close approaches. Even after dozens of hours spent in their presence, I am still humbled by their size.



Possible coloration options for the extinct Acrophyster Deinodon from the Miocene era. The two last options are the most likely, as they look more like some of the whale colorations of today. These illustrations where made in collaboration with Olivier Lambert of the royal museum of natural history in Brussels.

cetuselena: CA140B2 & CA140C. 4/18


CA140B2 & CA140C.


keiko-conservation:Video of the day is this IN…


Video of the day is this INCREDIBLE shot from @cascadiaresearch of a false killer whale hunting a mahi mahi. Shot by @uheheu under NOAA Permit.⠀
“This is just a teaser- if you want to see the longer clip, including the cameo of the Oceanic Whitetip Shark investigating the scene, check out our project page! (linked in @cascadiaresearch bio)“⠀
#falsekillerwhale #cascadiaresearch #justiceforkina

cetuselena: Cropped & up close.


Cropped & up close.

| W | Ko-Fi |

sitdow: Slave’s Cage Because no animals shoul…


Slave’s Cage

Because no animals should be keep prisonners for entertaining humans ~

I hope you like it ~

I made this drawing with watercolors and ink
You don’t have the right to use this drawing in any ways, thanks

derangedhyena-delphinidae: derangedhyena-delp…



Some imagery from The Remaining 74 Assembly today in Olympia. 

Toki was also included. In the MSQ kiddie pool.