I've got an interest in astronomy and have books on amateur telescope building dating back 50 years ( that's the books, not me
)
One of the tips for making a 'graticule' for a telescope eyepiece, used to measure the angular seperation of things like binary stars and cloud belts on Jupiter, involves keeping a colony of spiders and using strands from their webs as the material to make the crosshairs. It's very strong for it's diameter apparently.
I'll just keep terminating them with extreme prejudice though, nasty horrible things 😀