Colonist don't have bodies.

[DexTV]

I started a new colony and when they landed, they didn't have a body. They're just floating heads.
1. https://gyazo.com/8d4c6a39bc3be9891a45f27386de38ff
2. https://gyazo.com/d34ae298ee686166e5713637c903a72c

[Calahan]

A known issue I believe. Here is a recent bug thread on it, with a reply by Tynan.

https://ludeon.com/forums/index.php?topic=19781