I remember visiting Angel Island (a 0.5mi swim) and seeing the abundance of raccoons they have, and asked a ranger how they got there. They also swam.
Growing up on a lake I would regularly watch deer swim the quarter mile back and forth between the shore and a nearby island, with no problem.
Impressive though.
As a result, we have many animals, mostly birds, which are totally unique and also critically endangered. Many of them can only survive on offshore islands which have been comprehensively cleared of predators at vast effort and expense. The islands need to be relatively accessible since humans have to get to them to maintain them, but it turns out that once in a while a predator will swim quite vast distances for no apparent reason, and it only takes one to mess up years of painstaking work. Quite apart from killing a bunch of birds whose total remaining numbers might range from the tens to the hundreds of individuals.
Ironically, the ecology of an island itself came from events like a random animal swimming to it over the historical record and finding sufficient spare resources or an ecological niche they could satisfy sufficiently to reproduce. Distance from mainland and species diversity is very strongly correlated reflecting increasingly scarce odds of these "heroic journeys" at greater distances. Species themselves are capable of exhausting an islands resources and putting themselves into local extinction even with no human intervention (such as the case of the last of the mammoths on wrangel island).
My parent’s small pond, which has never seen a boat or any other real human activity, got them before the big lake it’s connected to did. Clearly there was some other way they could spread, presumably by bird.
Anyways, one by one every lake in the area no has zebra mussels. Even if they would only spread via human, it was clearly only a matter of time. As much as they suck (they’re sharp and attach themselves to basically anything in the lake) I’m not sure the expense has been worth simply delaying the inevitable.
Now that I'm jaded I ask myself how many government and private sector jobs were "created" (in sarcasm quotes because broken windows fallacy) washing all those boats for free over the years and whether they even expected to prevent the spread or if the spread is the justification for expansion.
;-)
One of the more amusing episodes for me, was when my daughter discovered this great group: The Beatles.
Some of my law students are only dimly aware of Jerry Seinfeld. And when I play a bit of the organ solo from Procul Harum's 1967 Whiter Shade of Pale (to illustrate a copyright-royalties point), I'm lucky if one person recognizes it.
Sic transit gloria mundi.
* https://rottnestchannelswim.com.au/
* https://en.wikipedia.org/wiki/Rottnest_Channel_Swim
The 36th annual Rottnest Channel Swim will be held on Saturday, 21 February 2026.
Come on down, the waters fine, the sharks rarely nip.
I'm suprised to see a HN comment along the lines of "most people don't ...", after all, most people don't program computers, start million and billion dollar companies, build out datacentres, fly planes, ... etc. The site is littered with people confidently doing things most people do not.
* https://www.iswimhappy.com/tas
* https://www.derwentriverbigswim.com/
The Rottnest swim is just a long warm bath for those that like to dip a toe in and start easy.
To the best of my knowledge few ever attempt the horizontal falls even at slack tide - the waters are warm but the salties and the sharks can be off putting .. come tide change the stoppers will eat people.
> than the water off the coast of Australia.
I should note that Australia is a large continent with an area equal to that of mainland contiguous USofA .. it's not all Gold Coast Qld, just as the US is not all Florida.
Eg: the current water tempreture in San Francisco ( 12.5°C / 54.5°F ) is on par with the September water tempreture when surfing offshore breaks in southern Western Australia (not Perth, the south coast where all the fun is).
You will, however, almost certainly know or meet someone that can flash the scars of a bite.
Shark bites - rarer than the headlines make out.
_However_ shark behaviour may well be changing due to increased human waste changing ocean patterns: https://theconversation.com/4-shark-bites-in-48-hours-how-wh...
Jellyfish - seasonal and locational. There are areas where you just shouldn't go in the water for a couple of weeks. Nasty.
Melbourne's currently got a bloom of lion's mane jellyfish that'll leave a welt (tingly red strip on the skin) for a couple of days.
* https://www.abc.net.au/news/2026-01-19/lions-mane-jellyfish-...
As far as sea misadventures go, easily the funniest thing I've seen (sorry, we're like that, laughing at danger) was a young kid surfing with a pod of dolphins getting fully pancaked by a breaching dolphin that cleared a wave top, made serious air, and landed smack centre on the kid and his board.
He (the kid) got winded pretty hard, did get his (damaged) board back, and was laughing about it afterwards.
The dolphin was not available for comment.
( Addendum: Dolphins being cheeky is more common than reported in W.Australia - here's one that did get captured on video: https://www.youtube.com/watch?v=oa7dSv3NBB0 )
Depending on the current, actual swim distance will be closer to 1.4-2 miles since it'll drag you out of a straight line.
Water temps vary by time of year, but are particularly mild from late summer through late fall. Even winter-time temps aren't particularly challenging. A dog could easily make the swim.
Currents are a challenge, but mostly if you're planning on landing at a specific point along the shore. If your goal is simply to make it to shore, they're far less an issue. Just swim cross-channel and you'll make it.
The physiological and psychological challenges are greatly overblown.
I wish everyone the best of luck here, but I can't shake the image of the lonely guy unwittingly calling young females in proestrus to their likely deaths. An appropriately gender-swapped Coyote Siren of Alcatraz.
Maybe female coyotes are smart enough to understand SF Bay tides and currents, or just to ignore the crazy loud guy. I sure hope so.
Alcatraz being the last place on Earth I would expect to see such savage beauty is of no consequence to the fact that it is we, humans, who make Alcatraz so treacherous. Mother Nature sees it as an opportunity to breed hella puppies.
I guess I hope that not too many suitresses are lost to the passion before he finds his mate of elevated luck and/or constitution.
Any resulting pups are going to have to make some difficult decisions though.
(Actually, assuming he's alive and found, relocating him is probably the most humane option)
Coyotes are territorial and usually have fairly large ranges. Alcatraz is small, but probably big enough to keep a breeding coyote pair well-fed and mostly out of the way of humans.
But the younguns will need their own territory after a year or so, and needing to cross the Bay to Marin or SF City would be have very low rates of success!
I really like the coyotes here.
Only dumbass mfs who let their pets off leash (I live in Pac Heights, you're supposed to have a leash on your dog at Lafayette Park and yet every day I see morons letting their dogs off leash OUTSIDE THE DAMN DOG PARK AREA. FUCK OFF!!!!) or let their small children go without supervision where they're not supposed to are at risk.
The worst part is that the authorities will put down the coyote (for being a coyote) and I hate reading stories about coyote culling.
Life would be so much better if morons were fined and eventually displaced into oblivion for making dumbass decisions that could have been easily avoided if they were not so negligent.
But yeah its nice to live in a city with cool nature like that. We have parrots, raccoons (there's a little family of them living near my home), coyotes, owls, hawks. Love it!
i do feel bad for the cats they sometimes eat, but unless they're strays house cats should not be let outside. otherwise, nature always wins.
For those of us living in suburbs, young children running just a few steps ahead (e.g. from the house to the other end of the driveway) can be in significant danger from coyotes.
Your hyperbole and cursing are not a great match for this forum and you should reconsider them or leave.
Almost anyone who is swimming for more than 15-20 minutes will be wearing a neoprene wetsuit and cap to keep warm (maybe a fur coat counts). The water temperature is 54F right now, and mid 60s in the Summer/Fall. There's a real risk of going into hypothermia at these temperatures.
The first time I tried it, the shock of the cold winter water made me swim faster in panic, which quickly winded me, and I was glad to get out of there! I had to learn to slow my breath and ease into my swim stroke.
I also found the open water disorienting. It's hard to swim in a straight line when the tide is pulling you, or the wind is pushing you, or the sun is in your eyes.
But if you want to give it try, there is a protected cove at Aquatic Park [0] with a dedicated swim lane and a great community. An informal group meets in the bleachers every day around 1-2pm (sunniest time of day), with everyone taking turns to watch your stuff.
There are also two (private) clubs that organize events (like the Alcatraz swim): the Dolphin Club (1] and the South End Rowing Club [2]. The clubs are nice because they have lockers and a sauna to help you warm up after.
It's not always fun (maybe it's type 2 fun?). A lot of the time it's frustrating. Like, why do my goggles keep filling with water? or why can't I get into a flow today? Or why do I keep having this intrusive thought that I can't see what's under me? (There have been a few seal bitings). Or sometimes it feels like I'm barely moving and I don't know why I'm dragging so much. Did the current/tide/wind change? If I don't sleep well, I feel it immediately in the water. It's a good gauge of your health/mood on that day. I got a lot out of it.
[0] https://www.nps.gov/safr/learn/historyculture/aquatic-park-p...
etempleton•2w ago
rconti•2w ago
When they explained why it hadn't been found, the quote was "I suspect the coyote was swept away...", but then later in the article it seemed clear the 'swept away' was in reference to the SF->Alcatraz journey, given the prevailing currents reported by the boat captain.
But then later in the article they re-stated the idea that it had been swept away _off_ the island, which doesn't really make sense given the currents.
Animats•2w ago