Seán Callahan

Just happy to be here.

[Seán Callahan @scaleyhan]

The impossible reptiles #whatthehell #lizard #snake

[Seán Callahan @scaleyhan]

Why do venomous snakes not just f***ing kill the people trying to harass them? Let me explain.

[HerpCoder @herpcoder]

Giant lizards demand maximum commitment. If we don't want legal regulation, we must ensure world-class care through self-discipline and standards. Poor husbandry and trophy collectors compromises animal dignity and risks the future of #reptile keeping.

[Seán Callahan @scaleyhan]

10,000 year old MOSS

[the_vanishing_wild @vanishing_wild]

America's Nature Crisis: WORST states pt 1

[Seán Callahan @scaleyhan]

I make videos about Earth’s Vanishing Biodiversity. This week, I tell the detailed story about the discovery & swift demise of the Steller’s Sea Cow. Hope you’ll watch, enjoy, and will follow along!

https://t.co/FRRE4CEsVK

[the_vanishing_wild @vanishing_wild]

Tune in tomorrow, May 23rd, at 7pm EST to hear the story of how the largest sea cows to ever exist were ruthlessly annihilated in a mere 27 years. We will post both on YouTube & right here on X!

https://t.co/LEQNRqk0oy

[the_vanishing_wild @vanishing_wild]

Orchid flowers that look familiar
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#nature #Plant #Science #discover #biology #biodiversity #Earth

[the_vanishing_wild @vanishing_wild]

This hypocrisy needs to stop.

#ClimateChange #ecology #Sustainability #construction #plants #road #trees #naturephotography #earth #biodiversity #Impact #commonsense #nature #conservation #animals #ProtectOurPlanet #EnvironmentalCrisis #ActNow #naturelovers #rainforest

[the_vanishing_wild @vanishing_wild]

Seahorses have an intricate lattice of interconnecting bony plates, arranged delicately and perfectly to give these animals their characteristic movement.
Image Credit: oVert TCN
#nature #earth #animals #naturelovers #biodiversity #naturephotography #explore #fish #science

[Seán Callahan @scaleyhan]

The pathetic sprinkles of rain were finally enough to get these males moving!

Ambystoma maculatum

[Kamil Szepanski @lungenlos]

So it begins! Earlier than in past years and so far only the opaque variant. Ambystoma maculatum

[Seán Callahan @scaleyhan]

Might as well emerge from my twitter hiatus for this. I'm so fortunate to have these fantastic people as co-authors, especially being my first publication 🙌

[Ramon Nagesan @RamonSN]

In a period with a lot of negatives, it feels good to end a week with a paper acceptance. It's been awesome to have had great co-authors: @jcroweriddell, @scaleyhan, @jaimiAgray, & Alison Davis Rabosky to work with on this. 🐍🐍🐍 #diceCT #herpetology

[Seán Callahan @scaleyhan]

@WildWildTWest @SamShablin !!!!!!! I never thought wallpaper could actually make me giddy

[Seán Callahan @scaleyhan]

@SalamanderTrav There is a population of two lined salamanders and dusky (D. fuscus) salamanders in eastern Michigan. To my knowledge, it's still contested whether they are invasive or native.

[Dr. Katy Greenwald @amphibs]

Our mudpuppy phylogeography paper is out in the Journal of Herpetology! So grateful to my amazing collaborators on this project.
https://t.co/FbpgwQeVaI
[should be Open Access soon, or email me if you'd like a copy!]

[Ramon Nagesan @RamonSN]

I had to get creative when setting up this #diceCT scan. The #snake will be chasing the #bat all night long in our scanner! #zoology #CtScanning @UMichEEB #oVertTCN #herpetology #mammalogy @NikonMetrology

[Seán Callahan @scaleyhan]

Spines of the left and right hemipenes on an 𝑂𝑥𝑦𝑟ℎ𝑜𝑝𝑢𝑠 𝑚𝑒𝑙𝑎𝑛𝑜𝑔𝑒𝑛𝑦𝑠… ouch.

Specimen from #UMMZ @UMichEEB

[Ramon Nagesan @RamonSN]

#Sharks in the morning, #snakes in the afternoon. It's never a dull day when you work in a natural history #museum @scaleyhan #herpetology #zoology

[Seán Callahan @scaleyhan]

@sarahanmy @Sternarchella @UMichEEB Hi Sarah! The eggs are laid via the snake’s cloaca.

[Seán Callahan @scaleyhan]

This 𝘓𝘦𝘱𝘵𝘰𝘥𝘦𝘪𝘳𝘢 𝘳𝘩𝘰𝘮𝘣𝘪𝘧𝘦𝘳𝘢 from #UMMZ @UmichEEB has 14 pearly whites in her! Even a basic threshold of the skeletal CT scan highlights the various stages of calcification, shapes, and impressive clutch size of the eggs in this female.