src/game/java/net/minecraft/world/entity/FlyingMob.java

package net.minecraft.world.entity;

import net.minecraft.core.BlockPos;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.phys.Vec3;

public abstract class FlyingMob extends Mob {
    protected FlyingMob(EntityType<? extends FlyingMob> p_20806_, Level p_20807_) {
        super(p_20806_, p_20807_);
    }

    @Override
    protected void checkFallDamage(double p_20809_, boolean p_20810_, BlockState p_20811_, BlockPos p_20812_) {
    }

    @Override
    public void travel(Vec3 p_20818_) {
        if (this.isControlledByLocalInstance()) {
            if (this.isInWater()) {
                this.moveRelative(0.02F, p_20818_);
                this.move(MoverType.SELF, this.getDeltaMovement());
                this.setDeltaMovement(this.getDeltaMovement().scale(0.8F));
            } else if (this.isInLava()) {
                this.moveRelative(0.02F, p_20818_);
                this.move(MoverType.SELF, this.getDeltaMovement());
                this.setDeltaMovement(this.getDeltaMovement().scale(0.5));
            } else {
                float f = 0.91F;
                if (this.onGround()) {
                    f = this.level().getBlockState(this.getBlockPosBelowThatAffectsMyMovement()).getBlock().getFriction() * 0.91F;
                }

                float f1 = 0.16277137F / (f * f * f);
                f = 0.91F;
                if (this.onGround()) {
                    f = this.level().getBlockState(this.getBlockPosBelowThatAffectsMyMovement()).getBlock().getFriction() * 0.91F;
                }

                this.moveRelative(this.onGround() ? 0.1F * f1 : 0.02F, p_20818_);
                this.move(MoverType.SELF, this.getDeltaMovement());
                this.setDeltaMovement(this.getDeltaMovement().scale((double)f));
            }
        }
    }

    @Override
    public boolean onClimbable() {
        return false;
    }
}