This Mod adds control functions for Spider Spawning in Minecraft, creating a variety of internal alternatives, reducing the appearance of said mob by 75%, 50% and 25% (at the player's choice):

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◾Examples Generals:

100% Normality /function mob_control_spawning:spider/spawn_normal
75% /function mob_control_spawning:spider/spawn_high
50% /function mob_control_spawning:spider/spawn_medium
25% /function mob_control_spawning:spider/spawn_low
0% /function mob_control_spawning:spider/spawn_none