Four water based mobs that live in rivers, lakes and oceans, and in snowy and frozen biomes.
Seal and Walrus
Both can be found out on the ice and snow of snowy and frozen biomes. Both follow anyone holding a fish and breed for one, and both drop fish currently.
A seal harms nothing, and bolts for the sea if it is hit. A walrus is as peaceful until one is hit. Then every walrus in earshot charges, a good deal faster than it lumbers, and into the sea after whoever did it.

Narwhal
The unicorn of the cold seas. Narwhals swim cold and frozen oceans, under the ice too, and now and then one comes up and stands its tusk out of the water. They want nothing of anyone. Using the horn of a narwhal you can craft a sword.


Narwhal Horn
assortedseacreatures:
Narwhal Horn
assortedseacreatures:
Stick
minecraft:
Accepts any wooden rods: tag #c:
Narwhal Sword
assortedseacreatures:
Shaped crafting recipe made in a Crafting Table. Row 1: Narwhal Horn. Row 2: Narwhal Horn. Row 3: any wooden rods (tag #c:rods/wooden, 1 item). Makes Narwhal Sword.
Sea Otter
Sea otters float on their backs in rivers and along milder coasts, and dive to get about. Afloat one cracks open sea shells and leaves one behind every so often, and it drops a few when it dies. I hear they like fish.

Sea shells make a set of armor and a shovel.


Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Shell Helmet
assortedseacreatures:
Shaped crafting recipe made in a Crafting Table. Row 1: Sea Shell, Sea Shell, Sea Shell. Row 2: Sea Shell, empty, Sea Shell. Makes Shell Helmet.

Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Shell Chestplate
assortedseacreatures:
Shaped crafting recipe made in a Crafting Table. Row 1: Sea Shell, empty, Sea Shell. Row 2: Sea Shell, Sea Shell, Sea Shell. Row 3: Sea Shell, Sea Shell, Sea Shell. Makes Shell Chestplate.

Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Shell Leggings
assortedseacreatures:
Shaped crafting recipe made in a Crafting Table. Row 1: Sea Shell, Sea Shell, Sea Shell. Row 2: Sea Shell, empty, Sea Shell. Row 3: Sea Shell, empty, Sea Shell. Makes Shell Leggings.

Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Sea Shell
assortedseacreatures:
Shell Boots
assortedseacreatures:
Shaped crafting recipe made in a Crafting Table. Row 1: Sea Shell, empty, Sea Shell. Row 2: Sea Shell, empty, Sea Shell. Makes Shell Boots.

Sea Shell
assortedseacreatures:
Stick
minecraft:
Accepts any wooden rods: tag #c:
Stick
minecraft:
Accepts any wooden rods: tag #c:
Shell Shovel
assortedseacreatures:
Shaped crafting recipe made in a Crafting Table. Row 1: Sea Shell. Row 2: any wooden rods (tag #c:rods/wooden, 1 item). Row 3: any wooden rods (tag #c:rods/wooden, 1 item). Makes Shell Shovel.
