I added all the night time mobs (Zombies, Skeletons, Creepers, Spiders, and Enderman) to a team I named red. I set the team color to red as well. Then I gave every entity on the red team a glowing effect and it work on everything except the Spider and the Enderman.

What I expected to happen was...:
Every mob listed above would be highlighted in red.

What actually happened was...:
The Zombies, Creepers, and Skeletons where all highlighted in red but the Spiders and Endermen wheren't.

Steps to Reproduce:
1. Create a redstone clock
2. Create a scoreboard team and set the color to red
3. Have the clock activate command blocks that add every entity (@e[type=zombie,skeleton,creeper,spider,endermen] (All in Separate Command Blocks)) to the created team above
3. Add command block activated by clock that has the command "/effect give @e[team=red] minecraft:glowing 1" in it
4. Spawn Spider and Enderman and their glow will just be white