Aidan O'Hanlon

Entomology curator @NMIreland & Invertebrate ecologist interested in all aspects of Irish biodiversity. 🐌🐞🦟🐚🦋 Personal account.

[Georg Waldmensch 🌳 @GWaldmensch]

Shifting Baseline Syndrom. Eins der großen Probleme in der Wahrnehmung des Artensterbens. Kurz gesagt: Das was wir als Heranwachsender kennen, wird als der Normalzustand empfunden. Damit verschiebt sich aber die Baseline von Generation zu Generation, und viel Information geht verloren… der tatsächliche Verlust an Vielfalt ist viel dramatischer als wir ihn wahrnehmen.

[butterfly world 🦋 @butterfly5World]

This insect is a female Giant Ichneumon Wasp, specifically the species Megarhyssa atrata (also known as the Black Giant Ichneumon Wasp).

[Earth @earthcurated]

The Conehead Praying Mantis probably the craziest insect you have seen all day! | photo by Marta Albareda

[Aidan O'Hanlon @MusingMollusc]

Roger Casement: humanitarian, nationalist martyr and amateur zoologist. Read a summary of my upcoming publication here:

https://t.co/HCF2BynfNd

[RTÉ Brainstorm @RTEBrainstorm]

Vipers, butterflies & parrots: the secret life of Roger Casement. Best known for his role in Ireland's fight for freedom, Casement's fascinating zoological legacy can be found in many Irish museums. By @MusingMollusc @NMIreland & Angus Mitchell RIA https://t.co/FJvb6IFHlk

[RTÉ Brainstorm @RTEBrainstorm]

Vipers, butterflies & parrots: the secret life of Roger Casement. Best known for his role in Ireland's fight for freedom, Casement's fascinating zoological legacy can be found in many Irish museums. By @MusingMollusc @NMIreland & Angus Mitchell RIA https://t.co/FJvb6IFHlk

[ᅠ ᅠ @greenvibe]

Sweet spotted ladybug catching the light, nature’s little lucky charm.

[TheJournal.ie @thejournal_ie]

For the third year in a row, a cuckoo has landed in Killarney National Park after flying over 9,000 kilometres from Ghana.

Cuach Cores had not been heard of since last Autumn after he’d successfully crossed the Sahara.
https://t.co/S4FIkWTaef

[World's Amazing Things @Hana_b30]

What a stroke of luck. Right time right place!

📸 arunkumar6974

[butterfly world 🦋 @butterfly5World]

: A touch of pink, a shimmer of blue, and a whole lot of nature’s magic. 🦋✨

[yohbo＠対馬 @yohbo]

トワダオオカ
Toxorhynchites towadensis (Matsumura, 1916)
日本最大種。 吸血はせず、この個体も樹液を吸汁。 胸部が金属光沢を帯び美しい。
長崎県RLで絶滅危惧ⅠB類。 対馬では市街地周辺でも見ることができる。
23.Ⅵ.2015　対馬市厳原町　#対馬の昆虫

[Entomological Society of America @EntsocAmerica]

Arthropod Photo of the Week: April 15, 2026
Millipede
Oxidus gracilis
Polydesmida: Paradoxosomatidae
Observed in Fort Mountain State Park, Georgia USA
By Steve Long (https://t.co/GJgO0GnzHl), Florida, USA
#arthropodPOTW

[The Last Homely House @AHomelyHouse]

This is the Eight Circled Cross page from the Book of Kells. The level of detail is absolutely insane; I made a replica of this a couple of years ago, and even scaling it up to twice the size, there were still sections I had to simplify because the detail was just too fine.

[Michael Bell @LearnNature]

Rare Greenland Shark washed up at Finisklin, Sligo.

[Graham Appleton @GrahamFAppleton]

Snipe news!
1/4
Two Snipe tagged in Iceland by José Alves left Ireland at dusk on 5 April and reached Iceland 17 hours later. See map.
Averaging 80 and 87 km/h
#ornithology

[Giorgi G. @GGarsev]

I just found out about this creature called Chilean Harvestman. Top tier creature design, I've got to say.

[わらび餅 @warabimochi_ic]

Uganda🇺🇬

[Polymarket @Polymarket]

BREAKING: Artemis II crew captures new photo of Earth.

[Entomological Society of America @EntsocAmerica]

Arthropod Photo of the Week: April 1, 2026
Sweat bee
Halictus ligatus
Hymenoptera: Halictidae
Observed in North Carolina, USA
By Rey Acevedo (https://t.co/Zjlcsr5nkc), North Carolina, USA
#arthropodPOTW

[Aidan O'Hanlon @MusingMollusc]

🤔

[claire @rosiekennedyxx]

Nobody fell off harder than the hammerhead shark. Was a top shark for me as a kid and now completely obsolete in media and conversation.