Anybody know what these are?

Games Halo 5: Guardians
1

http://1drv.ms/1P3csdJ
Sometimes they glow wHite things and some have plasma pistols near them for no apparent reason and they are in very weird places. Not a halo buff so any info would be cool.
Found these on mission Blue Team.

2

They look like little xenomorph plushies.

https://www.youtube.com/watch?v=bbNdkPcHElY

They’re part of an easter egg. There’s a few more in the level but I can’t find vids of them to show.

3

Y’know, there’s a lot of alien plushies that I’d buy, but that’s definitely not one of 'em.