Find (or summon) a Monster Spawner block and right click it with either a Husk or Stray spawn egg. The mob model inside the block will change, but no mobs will spawn.
Other eggs seem to work fine.
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Oh, do they have spawn conditions then? My mistake, that behaviour is not yet documented on the wiki. http://minecraft.gamepedia.com/Spawn#Spawn_conditions
Are you in the correct biomes for them?