Increased jump
Jumping became more frequent
Increased health
Beasts are fond of most types of fish
Mobs interact with sea plants
Collecting items
Inventory with many slots
Possibility of taming
Tricks (you need to use the command block for this)
Tamed dolphins search for underwater chests and collect prey for the user
Increased activity
Many types of interaction
Animated jumping
Fish hunting
Increased spawn rate
You can scratch the dolphin's back if you walk up to it and quickly move the camera from top to bottom.
A similar animation is available if you move the camera from left to right.But not everyone can become a real dolphin trainer, so this opportunity has been added to the world of MCPE. Build Improving Marine.

Disclaimer: This is an unofficial app for Minecraft Pocket Edition. This app is not affiliated in any way with Mojang AB. The name, brand and assets are the property of Mojang AB or its respectful owner.