Seán Callahan

The impossible reptiles #whatthehell #lizard #snake

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

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.

10,000 year old MOSS

America's Nature Crisis: WORST states pt 1

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! youtu.be/HYYeT9hVH88?si…

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! @TheVanishingWild" target="_blank" rel="nofollow noopener">youtube.com/@TheVanishingW…

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

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

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

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

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

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 🙌

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

Catch me never leaving my office ever again!!

@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.

Hey #AmphibianTwitter, Are there any examples of invasive salamander species outside of the barred tiger salamander? A quick google search did not reveal much.

Our mudpuppy phylogeography paper is out in the Journal of Herpetology! So grateful to my amazing collaborators on this project. journalofherpetology.org/doi/abs/10.167… [should be Open Access soon, or email me if you'd like a copy!]

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

Spines of the left and right hemipenes on an 𝑂𝑥𝑦𝑟ℎ𝑜𝑝𝑢𝑠 𝑚𝑒𝑙𝑎𝑛𝑜𝑔𝑒𝑛𝑦𝑠… ouch. Specimen from #UMMZ @UMichEEB

#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

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

@scaleyhan @Sternarchella @UMichEEB How does a snake lay eggs do they come from its mouth

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.