diff --git a/include/mondata.h b/include/mondata.h
new file mode 100644
index 000000000..8355a9fb9
--- /dev/null
+++ b/include/mondata.h
@@ -0,0 +1,179 @@
+/*	SCCS Id: @(#)mondata.h	3.3	2001/02/14	*/
+/* Copyright (c) 1989 Mike Threepoint				  */
+/* NetHack may be freely redistributed.  See license for details. */
+
+#ifndef MONDATA_H
+#define MONDATA_H
+
+#define verysmall(ptr)		((ptr)->msize < MZ_SMALL)
+#define bigmonst(ptr)		((ptr)->msize >= MZ_LARGE)
+
+#define pm_resistance(ptr,typ)	(((ptr)->mresists & (typ)) != 0)
+
+#define resists_fire(mon)	(((mon)->mintrinsics & MR_FIRE) != 0)
+#define resists_cold(mon)	(((mon)->mintrinsics & MR_COLD) != 0)
+#define resists_sleep(mon)	(((mon)->mintrinsics & MR_SLEEP) != 0)
+#define resists_disint(mon)	(((mon)->mintrinsics & MR_DISINT) != 0)
+#define resists_elec(mon)	(((mon)->mintrinsics & MR_ELEC) != 0)
+#define resists_poison(mon)	(((mon)->mintrinsics & MR_POISON) != 0)
+#define resists_acid(mon)	(((mon)->mintrinsics & MR_ACID) != 0)
+#define resists_ston(mon)	(((mon)->mintrinsics & MR_STONE) != 0)
+
+#define is_flyer(ptr)		(((ptr)->mflags1 & M1_FLY) != 0L)
+#define is_floater(ptr)		((ptr)->mlet == S_EYE)
+#define is_clinger(ptr)		(((ptr)->mflags1 & M1_CLING) != 0L)
+#define is_swimmer(ptr)		(((ptr)->mflags1 & M1_SWIM) != 0L)
+#define breathless(ptr)		(((ptr)->mflags1 & M1_BREATHLESS) != 0L)
+#define amphibious(ptr)		(((ptr)->mflags1 & (M1_AMPHIBIOUS | M1_BREATHLESS)) != 0L)
+#define passes_walls(ptr)	(((ptr)->mflags1 & M1_WALLWALK) != 0L)
+#define amorphous(ptr)		(((ptr)->mflags1 & M1_AMORPHOUS) != 0L)
+#define noncorporeal(ptr)	((ptr)->mlet == S_GHOST)
+#define tunnels(ptr)		(((ptr)->mflags1 & M1_TUNNEL) != 0L)
+#define needspick(ptr)		(((ptr)->mflags1 & M1_NEEDPICK) != 0L)
+#define hides_under(ptr)	(((ptr)->mflags1 & M1_CONCEAL) != 0L)
+#define is_hider(ptr)		(((ptr)->mflags1 & M1_HIDE) != 0L)
+#define haseyes(ptr)		(((ptr)->mflags1 & M1_NOEYES) == 0L)
+#define eyecount(ptr)		(!haseyes(ptr) ? 0 : \
+				 ((ptr) == &mons[PM_CYCLOPS] || \
+				  (ptr) == &mons[PM_FLOATING_EYE]) ? 1 : 2)
+#define nohands(ptr)		(((ptr)->mflags1 & M1_NOHANDS) != 0L)
+#define nolimbs(ptr)		(((ptr)->mflags1 & M1_NOLIMBS) == M1_NOLIMBS)
+#define notake(ptr)		(((ptr)->mflags1 & M1_NOTAKE) != 0L)
+#define has_head(ptr)		(((ptr)->mflags1 & M1_NOHEAD) == 0L)
+#define is_whirly(ptr)		((ptr)->mlet == S_VORTEX || \
+				 (ptr) == &mons[PM_AIR_ELEMENTAL])
+#define is_silent(ptr)		((ptr)->msound == MS_SILENT)
+#define unsolid(ptr)		(((ptr)->mflags1 & M1_UNSOLID) != 0L)
+#define mindless(ptr)		(((ptr)->mflags1 & M1_MINDLESS) != 0L)
+#define humanoid(ptr)		(((ptr)->mflags1 & M1_HUMANOID) != 0L)
+#define is_animal(ptr)		(((ptr)->mflags1 & M1_ANIMAL) != 0L)
+#define slithy(ptr)		(((ptr)->mflags1 & M1_SLITHY) != 0L)
+#define is_wooden(ptr)		((ptr) == &mons[PM_WOOD_GOLEM])
+#define thick_skinned(ptr)	(((ptr)->mflags1 & M1_THICK_HIDE) != 0L)
+#define lays_eggs(ptr)		(((ptr)->mflags1 & M1_OVIPAROUS) != 0L)
+#define regenerates(ptr)	(((ptr)->mflags1 & M1_REGEN) != 0L)
+#define perceives(ptr)		(((ptr)->mflags1 & M1_SEE_INVIS) != 0L)
+#define can_teleport(ptr)	(((ptr)->mflags1 & M1_TPORT) != 0L)
+#define control_teleport(ptr)	(((ptr)->mflags1 & M1_TPORT_CNTRL) != 0L)
+#define telepathic(ptr)		((ptr) == &mons[PM_FLOATING_EYE] || \
+				 (ptr) == &mons[PM_MIND_FLAYER] || \
+				 (ptr) == &mons[PM_MASTER_MIND_FLAYER])
+#define is_armed(ptr)		attacktype(ptr, AT_WEAP)
+#define acidic(ptr)		(((ptr)->mflags1 & M1_ACID) != 0L)
+#define poisonous(ptr)		(((ptr)->mflags1 & M1_POIS) != 0L)
+#define carnivorous(ptr)	(((ptr)->mflags1 & M1_CARNIVORE) != 0L)
+#define herbivorous(ptr)	(((ptr)->mflags1 & M1_HERBIVORE) != 0L)
+#define metallivorous(ptr)	(((ptr)->mflags1 & M1_METALLIVORE) != 0L)
+#define polyok(ptr)		(((ptr)->mflags2 & M2_NOPOLY) == 0L)
+#define is_undead(ptr)		(((ptr)->mflags2 & M2_UNDEAD) != 0L)
+#define is_were(ptr)		(((ptr)->mflags2 & M2_WERE) != 0L)
+#define is_elf(ptr)		(((ptr)->mflags2 & M2_ELF) != 0L)
+#define is_dwarf(ptr)		(((ptr)->mflags2 & M2_DWARF) != 0L)
+#define is_gnome(ptr)		(((ptr)->mflags2 & M2_GNOME) != 0L)
+#define is_orc(ptr)		(((ptr)->mflags2 & M2_ORC) != 0L)
+#define is_human(ptr)		(((ptr)->mflags2 & M2_HUMAN) != 0L)
+#define your_race(ptr)		(((ptr)->mflags2 & urace.selfmask) != 0L)
+#define is_bat(ptr)		((ptr) == &mons[PM_BAT] || \
+				 (ptr) == &mons[PM_GIANT_BAT] || \
+				 (ptr) == &mons[PM_VAMPIRE_BAT])
+#define is_bird(ptr)		((ptr)->mlet == S_BAT && !is_bat(ptr))
+#define is_giant(ptr)		(((ptr)->mflags2 & M2_GIANT) != 0L)
+#define is_golem(ptr)		((ptr)->mlet == S_GOLEM)
+#define is_domestic(ptr)	(((ptr)->mflags2 & M2_DOMESTIC) != 0L)
+#define is_demon(ptr)		(((ptr)->mflags2 & M2_DEMON) != 0L)
+#define is_mercenary(ptr)	(((ptr)->mflags2 & M2_MERC) != 0L)
+#define is_male(ptr)		(((ptr)->mflags2 & M2_MALE) != 0L)
+#define is_female(ptr)		(((ptr)->mflags2 & M2_FEMALE) != 0L)
+#define is_neuter(ptr)		(((ptr)->mflags2 & M2_NEUTER) != 0L)
+#define is_wanderer(ptr)	(((ptr)->mflags2 & M2_WANDER) != 0L)
+#define always_hostile(ptr)	(((ptr)->mflags2 & M2_HOSTILE) != 0L)
+#define always_peaceful(ptr)	(((ptr)->mflags2 & M2_PEACEFUL) != 0L)
+#define race_hostile(ptr)	(((ptr)->mflags2 & urace.hatemask) != 0L)
+#define race_peaceful(ptr)	(((ptr)->mflags2 & urace.lovemask) != 0L)
+#define extra_nasty(ptr)	(((ptr)->mflags2 & M2_NASTY) != 0L)
+#define strongmonst(ptr)	(((ptr)->mflags2 & M2_STRONG) != 0L)
+#define can_breathe(ptr)	attacktype(ptr, AT_BREA)
+#define cantwield(ptr)		(nohands(ptr) || verysmall(ptr))
+#define cantweararm(ptr)	(breakarm(ptr) || sliparm(ptr))
+#define throws_rocks(ptr)	(((ptr)->mflags2 & M2_ROCKTHROW) != 0L)
+#define type_is_pname(ptr)	(((ptr)->mflags2 & M2_PNAME) != 0L)
+#define is_lord(ptr)		(((ptr)->mflags2 & M2_LORD) != 0L)
+#define is_prince(ptr)		(((ptr)->mflags2 & M2_PRINCE) != 0L)
+#define is_ndemon(ptr)		(is_demon(ptr) && \
+				 (((ptr)->mflags2 & (M2_LORD|M2_PRINCE)) == 0L))
+#define is_dlord(ptr)		(is_demon(ptr) && is_lord(ptr))
+#define is_dprince(ptr)		(is_demon(ptr) && is_prince(ptr))
+#define is_minion(ptr)		((ptr)->mflags2 & M2_MINION)
+#define is_lminion(ptr)		(is_minion(ptr) && \
+				 (ptr)->maligntyp >= A_COALIGNED)
+#define likes_gold(ptr)		(((ptr)->mflags2 & M2_GREEDY) != 0L)
+#define likes_gems(ptr)		(((ptr)->mflags2 & M2_JEWELS) != 0L)
+#define likes_objs(ptr)		(((ptr)->mflags2 & M2_COLLECT) != 0L || \
+				 is_armed(ptr))
+#define likes_magic(ptr)	(((ptr)->mflags2 & M2_MAGIC) != 0L)
+#define webmaker(ptr)		((ptr) == &mons[PM_CAVE_SPIDER] || \
+				 (ptr) == &mons[PM_GIANT_SPIDER])
+#define is_unicorn(ptr)		((ptr)->mlet == S_UNICORN && likes_gems(ptr))
+#define is_longworm(ptr)	(((ptr) == &mons[PM_BABY_LONG_WORM]) || \
+				 ((ptr) == &mons[PM_LONG_WORM]) || \
+				 ((ptr) == &mons[PM_LONG_WORM_TAIL]))
+#define is_covetous(ptr)	((ptr->mflags3 & M3_COVETOUS))
+#define infravision(ptr)	((ptr->mflags3 & M3_INFRAVISION))
+#define infravisible(ptr)	((ptr->mflags3 & M3_INFRAVISIBLE))
+#define is_mplayer(ptr)		(((ptr) >= &mons[PM_ARCHEOLOGIST]) && \
+				 ((ptr) <= &mons[PM_WIZARD]))
+#define is_rider(ptr)		((ptr) == &mons[PM_DEATH] || \
+				 (ptr) == &mons[PM_FAMINE] || \
+				 (ptr) == &mons[PM_PESTILENCE])
+#define is_placeholder(ptr)	((ptr) == &mons[PM_ORC] || \
+				 (ptr) == &mons[PM_GIANT] || \
+				 (ptr) == &mons[PM_ELF] || \
+				 (ptr) == &mons[PM_HUMAN])
+/* this returns the light's range, or 0 if none; if we add more light emitting
+   monsters, we'll likely have to add a new light range field to mons[] */
+#define emits_light(ptr)	(((ptr)->mlet == S_LIGHT || \
+				  (ptr) == &mons[PM_FLAMING_SPHERE] || \
+				  (ptr) == &mons[PM_SHOCKING_SPHERE] || \
+				  (ptr) == &mons[PM_FIRE_VORTEX]) ? 1 : \
+				 ((ptr) == &mons[PM_FIRE_ELEMENTAL]) ? 1 : 0)
+/*	[note: the light ranges above were reduced to 1 for performance...] */
+#define likes_lava(ptr)		(ptr == &mons[PM_FIRE_ELEMENTAL] || \
+				 ptr == &mons[PM_SALAMANDER])
+#define pm_invisible(ptr) ((ptr) == &mons[PM_STALKER] || \
+			   (ptr) == &mons[PM_BLACK_LIGHT])
+
+/* could probably add more */
+#define likes_fire(ptr)		((ptr) == &mons[PM_FIRE_VORTEX] || \
+				  (ptr) == &mons[PM_FLAMING_SPHERE] || \
+				 likes_lava(ptr))
+
+#define touch_petrifies(ptr)	((ptr) == &mons[PM_COCKATRICE] || \
+				 (ptr) == &mons[PM_CHICKATRICE])
+
+#define is_mind_flayer(ptr)	((ptr) == &mons[PM_MIND_FLAYER] || \
+				 (ptr) == &mons[PM_MASTER_MIND_FLAYER])
+
+#define nonliving(ptr)		(is_golem(ptr) || is_undead(ptr))
+
+/* Used for conduct with corpses, tins, and digestion attacks */
+/* G_NOCORPSE monsters might still be swallowed as a purple worm */
+/* Maybe someday this could be in mflags... */
+#define vegan(ptr)		((ptr)->mlet == S_BLOB || \
+				 (ptr)->mlet == S_JELLY ||            \
+				 (ptr)->mlet == S_FUNGUS ||           \
+				 (ptr)->mlet == S_VORTEX ||           \
+				 (ptr)->mlet == S_LIGHT ||            \
+				((ptr)->mlet == S_ELEMENTAL &&        \
+				 (ptr) != &mons[PM_STALKER]) ||       \
+				((ptr)->mlet == S_GOLEM &&            \
+				 (ptr) != &mons[PM_FLESH_GOLEM] &&    \
+				 (ptr) != &mons[PM_LEATHER_GOLEM]) || \
+				 noncorporeal(ptr))
+#define vegetarian(ptr)		(vegan(ptr) || \
+				((ptr)->mlet == S_PUDDING &&         \
+				 (ptr) != &mons[PM_BLACK_PUDDING]))
+
+#define befriend_with_obj(ptr, obj) ((obj)->oclass == FOOD_CLASS && \
+				     is_domestic(ptr))
+
+#endif /* MONDATA_H */