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archosaurs

@archosaurs / archosaurs.tumblr.com

Here we appreciate archosaurs, from the humble hummingbird to the soaring Sordes. Occasional non-archosaurs might also make guest appearances. Icon by RJ Palmer.
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corvidaemnit

every single day I think about how american black vultures are known for engaging in allopreening (preening between different species)

and they have a specific relationship with crested caracaras, in which the black vultures assist them by not only preening them after meals but also leading them to food in the first place— due to their superior sense of smell— while the caracaras assist the black vultures by acting as a warning signal in case of danger

and while this is more typical of black vultures, this is not common at all for any member of the falconidae family— it’s a special bond!

yet another post in favor of vultures everyone , hope you enjoy:) and I implore you to do some more research on these incredible birds !!

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Happy Fossil Friday!

Who: Borealopelta markmitchelli

name meaning: "Northern shield" "Mark Mitchell"

pronunciation: Bore-ee-al-oh-pell-tah Mark-Mitchell-eye

What: A nodosaur, the un-clubbed kin to ankylosaurs

When: Early Cretaceous Period

Where: Alberta, Canada

Fun fact!: The specimen pictured above is one of the most well preserved dinosaurs ever discovered. It was discovered by miner Shawn Funk at Millennium Mine oil sands just north of Fort McMurray in Alberta. This local was perfect for exceptional preservation as the deposits were predominantly bitumen-rich (coal) sands. Preserved on the animal are not only skin impressions, but a snapshot image of what the animal would have looked like in life, and even red pigments have been found that indicate the hue of the skin.

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reblogged
Anonymous asked:

Would any dromaeosaurs have likely had bald heads like turkey vultures?

It's certainly possible, and I'd go so far as to say quite likely!

We do have some fossil evidence for dromaeosaurs with feathered heads:

As for the rest though, we don't have a clear fossil of a bald-headed dromaeosaur! To be certain, we'd probably need to find specific impressions of naked skin around the head, which to my knowledge has not been found yet.

The feathered fossils above belong to either small (right side) or medium-sized (left side) dromaeosaurs, so it indicates that any dromaeosaurs up to a Velociraptor-type size certainly could have had feathered heads.

That being said, the level of head feathering is very variable in modern birds even within the same group. Some vultures have bald heads which may help with cleaning their faces and heat regulation, but there's much wider variation than you might expect! Even just within the clade Aegypiinae, we've got:

There's a whole range from nearly full plumage to fully naked skin folds to Justin Timberlake Ramen Hair, and I'd say there's no reason to think that dromaeosaurs and other feathered dinosaurs couldn't have had the same level of variation between species!

It's the kinda situation where in the absence of direct evidence, I'd consider varying levels of head baldness in dromaeosaurs as pretty reasonable speculation! So here's a Deinonychus decked out with a variety of different styles that are within the realms of possibility:

And that's not even taking into account that in a lot of bald-headed birds that skin space is prime real estate for all sorts of flippy flappy dangly bits and colours and lumps and bumps.

So basically, it's not like we can point at any particular dromaeosaurs and be like "that one probably had a bald head", but unless there's contrary evidence I feel it's very likely there was a lot of variation in how feathery the head was!

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kaijutegu

Aug ABSOLUTELY deserves the praise, @ryukikit. St. Augustine Alligator Farm is one of my favorite animal facilities, hands down. It's a pretty zoo, doable in an afternoon if you kinda like crocodilians, or an all day affair if you REALLY like crocodilians. Here are my favorite things about it and why I think it's worth supporting.

1. They keep animals in interesting social groups.

Crocodilians are heavily involved parents, but most places that breed them don't have the enclosure space to let the babies stay with the parents. St. Augustine does. One of my favorite groups was their crèche of slender-snouted crocodiles. They had the parents and then a yearling cohort and a new hatchling cohort. This aligns with how these guys live in the wild- the babies stick around longer! They have the space for it, and they are very in tune with the social needs of their animals.

Very, very few zoos can keep their baby crocs with the adults and still perform maintenance and animal health checks safely. This doesn't mean these facilities are bad- it just means that they have different management practices. And frankly, a lot of these species aren't frequently bred elsewhere. Your average zoo doesn't need a setup where you can have a multiyear crèche for slender-snouted crocodiles. Some species have better success when the young are pulled early, and some zoos are better set up to raise out any offspring separately or behind the scenes. Every facility's practices are different, and this just happens to work well at St. Augustine and be really enjoyable to see as a zoo patron.

Crocodilians are exceptional parents and very protective. It's a sign of incredible animal management practices and animals that feel very comfortable with staff that St. Augustine can do this with nearly every species they breed.

2. They understand the social needs of their animals.

Some crocodilians are social. Some are solitary. Some can live happily with a member of the opposite sex but get territorial around members of the same sex. St. Augustine pays incredible attention to their social groupings to ensure that they aren't just meeting the animals' physical health needs but their social needs as well. They do continuous scientific research about social structures in crocodilians, taking blood samples to test stress hormones and observing stress behaviors to see how group dynamics change.

For example, St. Augustine is home to one of the world's largest known living saltwater crocodiles, Maximo. And his comparatively tiny mate, Sydney. During the educational presentations with these two, they point out that even their monster of a croc needs his social group- he won't eat if she's not around and he is calmer during medical checks if he can see her. These animal share a deep and special pair bond, and they make sure to talk about how the social aspect of these animals' lives is integral to their care. It's a unique aspect of the way they talk about these animals, because he IS a spectacle and he IS a sensation, but they don't talk about him like he's a mindless killing machine- they talk about him like he's a big, complex predator with social needs like any other animal. Aug is the only facility I've been to where the emotional and social needs of crocodilians is part of the education they provide guests- and speaking of education...

3. Their demos and presentations are extremely good.

The presentations at St. Augustine are some of the best I've ever seen, and I've seen literally hundreds of animal talks on everything from aardvarks to zebras. But as you... can probably tell from my blog content, I've spent a lot of time learning about and working with reptiles. I really enjoyed all of their presentations because they are very scientific about things and avoid sensationalism. They really want you to be fascinated by these creatures and love them- but more than anything else, they want you to respect them.

Also, they do a really good job handling their ambassadors. I really enjoyed something as simple as watching an educator tell us about snakes. Throughout the whole presentation she made sure that most of the snake's body was looped in her hand. The snake was always supported and was very calm. She gave the snake plenty of head room so that it didn't feel constricted- it was just good handling all around.

But also, the presentations made it clear how much the park cares about the animals' well-being. When they do the feeding and training presentations, they make it very clear that the animals' participation is entirely voluntary. They do things differently for their 9-foot saltie and their 16-foot saltie, because the 16-footer is so large and heavy he actually struggles walking on land sometimes. They adapt their programs and his care to ensure that he's completely comfortable- and he didn't actually participate in the whole feeding when I was watching! At no point did they try to push him into anything uncomfortable; they offered, he didn't engage, and they moved on. It was a clear expression of his boundaries, and I really appreciated how much his caretakers respected that.

4. Ethical Interactions

I've been to... a lot of tourist locations in Florida that have animals you can hold. Almost always against my will! Many of them are pretty terrible, and you don't actually learn much, if anything. But I really found that to not be the case at St. Augustine. Every single animal presentation and interaction opportunity was accompanied by education about the animal's biology, habits, and- crucially- their conservation status.

When I held a baby alligator at St. Augustine, the proctors- there were two, one to ensure I was holding the gator correctly and the other to educate- were very informative about the role alligators play in their ecosystem and their conservation history. The animals were all properly banded, and one of the two proctors was there to ensure that none of the baby alligators were uncomfortable. As soon as they started getting squirmy or tense, they were removed, unbanded, and taken to an off-exhibit area to relax. And when the babies age out of petting size, they just go in the lagoon to live with others of their species. I saw one upset alligator the entire time I was there, and he was clearly upset that his escape attempt was foiled by a keeper during my nursery tour.

Even though he's restrained in this shot, you can see that his full body and tail are supported, and the grip, while firm, is gentle. He's distressed, but after I took this picture, she put him in his enclosure and he calmed down immediately.

Sometimes when you have petting attractions with baby animals, those animals... don't have a happy ending. (See: cub petting.) But St. Augustine's program is fine- the gators are all aged out of wanting to have mom around, there's no declawing/defanging, and they're handled with care. And it's worth it, because people love what they understand. St. Augustine was integral in raising public awareness about alligators back in the 60s when they were endangered, and now they're thriving- largely in part to programs like St. Augustine getting people to care.

And speaking of getting people to care, let's talk about their research.

5. Shared Research Results

St. Augustine is also home to more species of crocodilian than anywhere else in North America- all of them, usually. (They didn't have a Tomistoma when I visited- that may have changed.)

Because of this species diversity, it's an incredible research resource. Having every species means that you can do a lot of work comparing their behaviors, their growth patterns, and more. They've been a major research site for crocodilian biology since the 1970s. Today, they're one of the key sites for studying crocodilian play and social behaviors. They actually maintain a blog where they post copies of papers that were written using their animals, meaning that you can actually see the results of the research your admission helps fund. You can see that right here: https://www.alligatorfarm.com/conservation-research/research-blog/

All of this adds up to a zoo that provides a unique experience, tons of actual education, and transparency about what its research and conservation steps actually are. St. Augustine's come a long way since its opening in 1893, and they really do want you to leave with a new respect for the animals they care for. Ultimately, if you're a fan of reptiles, you can feel good about visiting the St. Augustine Alligator Farm- their care and keeping are top of the line, they do a ton of innovative conservation research and support for conservation organizations, and you can see this animal there:

(Gharial from the front. Nothing is wrong with her that's just what they look like from the front.)

Yes to all of this! If I may also add, I can personally attest that their veterinary care for animals is top notch. Every animal from the tiniest birds to enormous crocodiles are monitored very closely and routinely examined by veterinarians specializing in zoological medicine. When one of their alligators was suffering from an inner ear infection he was packed up and transported to a facility for a CT scan! The Alligator Farm was the first zoo to earn a perfect score from the AZA and they set a shining example for animal care in many ways.

YEAH so another incredible thing- I thought about talking about this but cut it for time- is that they have some of the most innovative vet practices I've ever heard of. I got to tour their veterinary holding area and something that's really unusual is the way the animals are held. The pools they're in are all geothermal spring water with a ludicrously high sulfur content. Why would you use this, instead of a sterile/filtered water pool for a recovering animal?

Because sulfur is naturally anti-fungal and antibiotic. Sulfur compounds are regularly used in human dermatology for these properties, and the sulfur content in the water helps protect the recovering crocodilians' wounds from infection. It also helps protect their skin, even if it does promote algae growth. It's little things like that where they spend just that much extra time thinking about how to improve the animals' quality of life that have me so impressed with St. Augustine Alligator Farm as a facility.

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bookrat

In no particular order, my fave projects for this year. There were 70 again, meaning I failed my resolution to work less hard this year.

It was good to finally finish this Caudipteryx. Other sculptor didn't like the feet and I waited like 2 years for him to make new ones before losing patience and doing it myself.

This expressive little cutie:

This little guy has the file name 'cutestsino' and he earned it.

Worked really hard on this new Kulindadromeus with the incredibly unintuitive tail scales, and I'm not going to let the fact that you can't see him get in the way of him being a favorite

This scutellosaurus pair. It's kinda hard to have 2 critters interacting when they're this size and need to travel separately

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apolladay

Did you know that birds are 100% living dinosaurs and that not all dinosaurs went extinct? Birds aren’t just “cousins” to dinosaurs, they ARE dinosaurs. If you need evidence, here’s one of the many articles that support this: https://evolution.berkeley.edu/what-are-evograms/the-origin-of-birds/

Yes, I did know

No I didn’t know

I somewhat knew/Other

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Petition for Canada to stop arming Israel

In case you haven’t seen it yet: here’s a petition for Canada to stop arming Israel. https://www.ourcommons.ca/petitions/en/Petition/Sign/e-4745

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fatzorro

Here’s a proper link to the petition. And some additional details:

  • This is not a random change.org petition that’s not going to be seen by anyone important - this is a petition authorized by a Canadian member of parliament that will be reviewed by the Canadian House of Commons.
  • You must be a citizen or resident of Canada to sign.
  • Petition closes on February 24th, 2024.
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