The oxygenation of the ocean. Never knew that was a mass extinction! So much interesting stuff came from that!

I wouldn't call any extinction event a favorite, because it is a loss. An interesting one that is less known than the Dodo is that the wake island rail bird was hunted to extinction by starving Japanese soldiers in WWII. The Americans blockaded the island, trapping the Japanese there, and they ate all the birds in just a couple years time.

I think it's an interesting extinction because it's an unintended casualty of war.

Not a full on extinction event, but the late bronze age collapse has always fascinated me. So much do that it led me to pursue archaeology in college.

So many theories, everyone has their favourite, but yeah, what ultimately caused every near eastern civilisation as well as the Mycenaean Greeks to just all collapse and disappear over a relatively short 200 years or so (archaeologically speaking a blink-of-an-eye)

The Holocene.

whichever the next one is that'll be my favorite

Discussion: you can have an "extinction event" in any ecosystem-- not just biological ones.

For example, the abandonment of steam locomotives in the mid-20th-century, or the Home Computer crash of the 1980s.

Similar to a biological mass extinction, you have:

• A discernable ecosystem change, either a sudden event (the introduction of reliable, mass-produced diesel locomotives), or a measurable decline of "habitability factors" (as hundreds of firms brought cheap 8-bit computers to market, retail space and overall consumer interest saturated)
• a rapid diversification of new and exotic types to fill the vacated niches (the cabless "B-unit" and flexible "road-switcher" locomotive types didn't exist in the steam era. The post-crash computer market brought in new entrants like cheap IBM clones, the C128 and Atari 130XE, all chasing a sub-$1000 market that was now free of Sinclair, Coleco, and Texas Instruments)
• followed by a shake out and consolidation of the survivors/winners as they select for fitness in the new world (ALCO was a strong #2 in the diesel locomotive market in 1950, but didn't make it to 1970. The C128 never became the world-beater its predecessor did.)
• a few niches largely untouched (China was still building steam locomotives into the 1990s. The Apple II series lasted about as long.)

When the hyper intelligent dinosaurs lost control of their nuclear power plants and their society collapsed.

Just a pet theory of mine.

The ongoing one, cause I get to take part in it!

The one with the internet, whatever that's called.

The Azolla Event. https://en.wikipedia.org/wiki/Azolla_event. I mean it is cool and the major climate shift it helped create certainly caused some extinctions. But plants can change the world, never forget!

Devonian. I was extincting before it was cool.

Zombie apocalypse. Anyone left over is either immune from the cause or smart enough to avoid it.

Just me but I like the idea of a peaceful world.

Late-Permian extinction. Not very imaginative, but I find it cool that there are so many hypotheses even about the largest mass extinction ever.

The current one playing out. Because I 'm tired.

Im not mad about this current one.

Nice try, FBI!

The next one of course

Not sure if it counts but the devonian extinction is probably my favorite. Wiped out a bunch of marine vertebrates (I hate fish, they had it coming)

The theories behind why it happened changed, and it's technically two small extinction events. Although it is pretty big iirc >95% of the worlds vertebrates died off and did not come back

The Oxygen catastrophe. Without it I wouldn't exist.

Great Dying 2: The Human Boo Boo

I like it because I have been unwillingly participating in it for decades. 70% loss of population on average for monitored species since 1970. It is not going to get better any time soon either.