Simple enough. Checks if entity is on the Top block or fill block as listed in the current biome.

Could be useful to use as above ground check. Essentially could auto implement the vanilla grass checks, but change for biome: deserts sand, EX Mountain Ridge would be red rock.

Need to test snow biomes to determine if snow coverings would interfere. Should not vanilla animals already spawn there iirc.

Closed via 567bc6b