The yCreatures addon adds many living things to the Minecraft Bedrock Edition. They fit perfectly into the atmosphere of Minecraft on Android. Other animals from the mod should have been in MCPE for a long time. The developers did not add them, but the author managed.
The yCreatures addon works on version 1.14. New animals do not replace anyone in MCBE. They are well developed – they have their own models, textures and behavior. This addon is definitely from the category of musthave. So you should definitely download this addon for Minecraft BE.