Minecraft wiki entry for Spawner, associated text: A blaze spawner in a nether fortress.
A dungeon, connected to another dungeon, with two spawners.
A spawner edited to spawn zombies wearing enchanted diamond armor.
Light required to disable a blaze spawner.
A monster spawner that spawns skeletons.
A spider spawner that generated on the surface. The spawner is located roughly in the middle of the picture, underneath a cobweb.
Chickens spawning from multiple spawners.
A spawner in an older version of Minecraft.
Cave spider spawner seen from a chamber.
Spider spawner in a woodland mansion.
A magma cube spawner inside the Bastion Remnant.
A spider spawner connected to a mineshaft.
Two blazes spawned near a blaze spawner and a wither skeleton.
Pig spawners generating when a buried treasure chest spawns inside a spawner (Fixed in 1.17 pre1).
Amethyst geode with mineshaft and 2 cave spider spawners. Check the image for more details, including seed and coordinates.
2 cave spider spawners next to each other.
Spider spawner generated right next to the village.
Mineshaft and skeleton spawner generated at the very bottom of the world.