Listen To Me, Boy. You Will Hear About Sea Slugs. You Will Enjoy Sea Slugs

🐙 Daily Cephalopod Fact: 🐙

Flamboyant Cuttlefish: Cuttlefish have a specialized, hollow feature called a cuttlebone that helps the animal maintain buoyancy by adjusting the levels of gas and liquid in its chambers.1 Because the flamboyant cuttlefish’s cuttlebone is relatively small, this species can only float and swim for short amounts of time. Instead of swimming, flamboyant cuttlefish “walk” along the ocean floor using their arms. They also have a highly developed sensory system that helps them respond and adjust to their surroundings.

ScienceAlert

The Y Chromosome Is Slowly Vanishing. A New Sex Gene May Be The Future of Men.

The sex of human and other mammal babies is decided by a male-determining gene on the Y chromosome.

The sex of human and other mammal babies is decided by a male-determining gene on the Y chromosome. But the human Y chromosome is degenerating and may disappear in a few million years, leading to our extinction unless we evolve a new sex gene. The good news is two branches of rodents have already lost their Y chromosome and have lived to tell the tale. A 2022 paper in Proceedings of the National Academy of Science shows how the spiny rat has evolved a new male-determining gene.

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Uncharismatic Fact of the Day

It's not every day you see a fish walking on land! However, when the streams and ponds of the airbreathing catfish dry up, this species will readily wriggle across the jungle floor in search of a new home. Thanks to a special organ called a labyrinth organ, they are able to breathe air and can remain outside of water for several hours provided they stay moist.

(Image: A Java walking catfish, Clarias batrachus, by sdickman via iNaturalist)

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Snails in the genus Julia have a bivalved shell, like a clam!

Even though they have a clam like shell, with 2 sections, they are in fact snails (class Gastropoda). They are marine snails, found throughout the Ino-Pacific. There are 6 species which are various shades of green. Julia are tiny, only reaching a length of up to 6 mm long. They feed on algae, and incorporate the chloroplasts from the algae into their bodies. Some of the chloroplasts remain photosynthetic, and the snails are able to feed on the products of this photosynthesis. This process is called kleptoplasty.

Photos: Julia sp. from Australia  - profmollusc | Inaturalist cc; Julia exquisita from Reuinion Island - Alexandre LaPorte | Wikipedia cc

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do eastern hognoses get attacked by toads a lot? them being immune to their poison seems really specific

Quite the opposite! Many toads secrete toxins to avoid being eaten (most animals don't like eating poisonous food).

However, because they really like eating toads, hognose snakes have evolved specifically to be immune to those toxins. There are many examples of this kind of co-evolution in the animal kingdom (another common one are garter snakes and salamanders).