Squids & endermites can't be spawned without AI

If you try to spawn a pig,for example,with the command
"/summon Pig {NoAI:1}" he won't move,he's not affected by gravity,doesn't eat etc...
But if you try with Squids they are affected by gravity and swim if you spawn them in water... Command:"/summon Squid {NoAI:1}"
And if you do the same with endermites (/summon Endermite {NoAI:1}) he won't move,but after a short period of time he'll disappear
for the ones good with commands: I tried to put the tag {PersistanceRequired:1b},but still doesn't work
it can't be explained with an image,sorry