I created this mod mostly for my own amusement, but I thought that now I have worked out most of the bugs I might as well share it.

In this mod I've tried to create a more realistic game world by eliminating many of the fantastic creatures and plants*, adding more real-life creatures and plants, and changing the dynamics of farming. I have also eliminated many of the underground creatures and plants, since I find them especially implausible. I left most of the underground aquatic creatures with the idea that they are part of an ecosystem sustained by thermal vents similar to those in the deep ocean. A few terrestrial underground creatures remain as peripheral members of this ecosystem.

*(I've kept a few that I can imagine being part of a single, real folklore.)

This mod was created on a Mac.

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This mod uses:
Language Unlocked v.1.3 by Moogie (with the no_rear_adj_adv option)
Modest Mod v.2.0 by Igfig (with modules cat damper, pedestals, seasonal crops, and skill tweaks)*
Hiveable Silkmoths of 28 Mar 2012 by Rhenaya
The reaction CREMATE_REMAINS from Genesis 5.18
Items ITEM_ARMOR_MATLE and ITEM_ARMOR_PONCHO from High Fashion! of 09 Mar 2012 by Williham

*(some of the changes made by ModMod have been juggled or superseded by other changes)

This mod also incorporates a modified version of Dwarven Higher Learning v.2.2 by Shukaro

Olly added the [CAN_STONE] tag to battle axes, picks, spears, and mauls, but removed it from short swords.
Olly added [MAX_EDGE:10000] to selected stones with guidance from the Mohs scale values given in Wikipedia.
Olly removed the weapon and ammo tags from silver.

Olly made metal leggings a separate object.

The creatures were selected from vanilla DF and Flora and Fauna v.0.34i.
Olly changed some names of domesticated animals to make it easier to tell apart the males and females.
Olly removed [EVIL] and [GOOD] tags from creatures.

The plants were selected from the same sources and heavily modified by Olly.

There are original civilized creatures (based on vanilla humans).
There are original entities created with the help of nocker's useful template.

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Thanks to my friend Z. for his help testing this mod.