.ko files in /boot/kernel

[Seamus Abshere]

/boot/kernel is full of .ko files for kernel options that I did not
select. Why are they there? Are they in use?

[/boot/kernel]#ls -l kernel
-r-xr-xr-x  1 root  wheel  2317346 Jul  2 16:11 kernel

I'm proud of this (supposedly) 2.3MB kernel, and I want to
make sure that I have actually optimized my machine and not made a
stupid mistake that does the opposite.

Thanks again,
Seamus