Animal Beasts Heads on Chests

Everytime we see a Sentai Robot formed by animals and Beasts Toei makes the head of an animal / beast on the chest. If there's any robot / megazord to add in I'll make another picture. Some of the robots had that and some don't and used animal / beast's head as a helmet like Gekiranger and Gingaman.

Shinken - Oh - (Samurai Megazord)
Oh Ranger Robo - (Zeo Megazord)
Gao King - (Wild Force Megazord)
Abarenoh - Dino Thunder Megazord)
Gosei Great and another Goseiger Robot from the movie (Goseiger)

Ohranger, Shinkenger, Gaoranger, Abaranger, Goseiger