swim and soar update

I think Minecraft needs more passive mobs because we only have 32 passive mobs out of 80 mobs. It would vastly improve creative building by adding new features like new armour, new blocks or new biomes. Idea no.1. rock crab. The rock crab would be a passive crab that would spawn on beaches or underwater. Their rocky shell would be covered in shells which would spawn on beaches and underwater. They would hunt tropical fish from the ocean floor. They can also be placed in buckets. Idea no. 2. pigeons. Pigeons would fly around villages and would eat crop seeds after being placed, and a scarecrow would be seen in village gardens to stop them from eating the crops. Scarecrows are crafted by placing a hay block in the middle and sticks below and beside the hay block, then a carved pumpkin above the hay block. Idea no.3. Vultures. Vultures would fly around the desert, circle around the player and, if provoked, would swoop down and attack. If you kill one, they might drop an animal skull which could be worn as a helmet for 2 and a half armor points and could be placed. A new block that would spawn on trees would be a nest, which you could craft by placing sticks on all crafting table spots and a pigeon would land in after 2 days. You could also put a chicken, pigeon or vulture egg  in a nest to hatch and be your pet after 2 days. Bird cages could also be crafted by placing iron bars up, down, left and right and you could put a pigeon or a parrot in it. Those are all my ideas. Thanks!