This is actually only part true. During the night, as the temperature in their environment drops, most species leave their den or web and seek out the mouth of any nearby sleeping mammals to sleep in, as it will help retain heat. In tests, it has been observed that up to thousands or tens of thousands of spiders will travel up to 10 miles to willingly climb into the open mouth of a sleeping human.
That tens of thousands number is always brought up, but it's an average that is affected by the actions of Spiders Georg, an outlier who should not be counted.
The only thing spiders like more than a warm mouth is a warm butthole. The human butthole is the perfect environment for a spider to get nice and cozy. It's estimated that the average person has 10 spiders enter their butthole every year (and on average 9.95 exit).
They are so cannibalistic. I once hatched an egg case in a terrarium and they ate their brothers and sisters almost immediately after hatching. There were baby crickets in there and they did not care for them in the slightest as the mantid population fell like a cobalt state sanctioned murder cube falls on a head.
My kids have a book called "solitary animals," explicitly framed as introverts in nature, and from what I remember of it, it mentions pumas, octopuses, sloths, and eagles.
Possibly the one thing that is preventing them from creating culture/civilisation with how smart they are. Maybe they'll get their shit together when we're gone. Planet of the apes is too played out.
There's that, and also their short lifespan (1 to 5 years).
And the fact that the mother only cares for their offspring while they're in eggs.
Forms of transmission of behaviors by imitation or communication mostly emerge in species that care for their young, like birds or mammals, because the young learns from their parents, which complements instinct. It gets stronger when they're a social species, because they also learn from every other individual. That's when culture begins to emerge (like how some "accents" or "dialects" can be identified in the songs of birds or whales of a same species). But a specie that isn't social and doesn't care for it's young, whatever an individual learnt in its lifetime dies with it, behaviors can only be transmitted genetically edit: inexact,seebelow , so they're slower to evolve.
[EDIT : I looked up some things online to make sure I wasn't spreading disinformation (should've been the other way around, sorry...) and it seems some nuance needs to be added to two things;
Despite being usually asocial and sometimes confrontational, octopuses can occasionally display social behaviors such as signal, so they're not devoid of inter-individual communication source
They seem to be able to learn from each-other to a certain extent. Source
I still think my point mostly stands, but it's a bit shakier than I thought.]
Randy is (was? Not sure if he's still alive) a goat on a friend's farm. Fucker hated everyone and everything and would have to be kept in his own area. Did you know goats can spit? I didn't until I met Randy. Friend told me Randy killed a cat once. Not sure why they didn't just turn him into dinner.
Polar bears except when mating, and even then they still hate any offspring that aren't their own. Most big cats like tigers, panthers, and jaguars. Tons of predators are solitary.
Tons of animals that are solitary should fit the criteria. Hates might not be a completely accurate description, but if they are solitary and territorial then it would be close enough.
I was going to put in mountain lion and figured someone would go "lions hunt in packs!" and tried to use an alternate name. Forgot panther is also used for jaguars!
Most every animal species? Fun fact, they nearly all, at an individual level, die very quickly.
Sorry to say that as a human, you’re hard wired to engage with nearly every being on this planet as though it is sentient and beloved, because we’re a bunch of dumbasses.
Betta fish - just make sure to give them a few gallons of water in which to swim, a filter for their poo and a heater in their tank to keep them comfortable year round.
It's mostly only the males that don't get along with each other. Given enough space, females can be peacefully kept together in sorority tanks. Similarly, a trio or harem (i.e. one male with multiple females) is typically safe as well and the fish get along just fine, given a large enough tank and appropriate stocking.
Also, most reputable breeders and sources of information will tell you that 5 gallons / 19 liters is the minimum suggested tank size for a happy and healthy fish in optimal conditions. While they can certainly survive in much smaller bodies of water, it's not ideal and in some cases it's actually harmful.