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FREQUENCY:  Rare
NO. APPEARING:  1-6
ARMOR CLASS:  3
MOVE:  9”/24”
% IN LAIR:  75%
TREASURE TYPE:  H
NO. OF ATTACKS:  3
DAMAGE/ATTACK:  2-5/2-5/4-16
SPECIAL ATTACKS:  Breath weapons and possible magic use
SPECIAL DEFENSES:  Nil
MAGIC RESISTANCE:  See text above, Adult = 0, Old = 0, Very Old = 5%, Ancient = 10%
INTELLIGENCE:  13-16
ALIGNMENT:  Pure Neutral
SIZE:  L (28” long)
PSIONIC ABILITY:  Nil

CHANCE OF SPEAKING: 60%
MAGIC USE: 65%
    Druid spells = 100%
SLEEPING: 20%

The Brown Dragon always lives in a forest, though it may be in a
cave within a forest. The dragon is true neutral and interested in the
welfare of the forest above all else, though it does have a weakness
for crafted jewelry of all types. The brown dragon can shapechange
to a small mammal, lizard or bird once per day at its 2nd age level,
twice at 4th, three times at 6th and 4 times at 8th. The shapechangeling can, at the very most, inflict 1-2 points of damage with claw,
beak, bite, etc. However, the shapechangeling can have the dragon's full hit points and full benefit of its normal saving throws.

A brown dragon can attack with claw/claw/bite, or either of its
2 breath weapons, Faerie Fire and LIGHTNING. The Faerie Fire
covers an area of 6"x6" at a range up to 3" from the dragon's
mouth. Any in the fire are covered (no saving throw) for 4-80 turns
and they also take the sum of the dragon's age level and HD in
damage unless a saving throw versus magic is made, in which case
they take no damage. The Lightning is in a single bolt 8" long and
½" wide for full age times HD in damage, or ½ if a S.T. is made.

Brown Dragons which speak and can cast spells use Druidic spells:
 

Age Group	Spells castable per day
first	2 first-level spells
second	2 first and 1 second-level spell
third	2 first and 2 second-level spells
fourth	2 first, 2 second and 1 third-level spell
fifth	2 first, second and third-level spells
sixth	3 first, second and 2 third-level spells
seventh	3 first, second and third-level spells
eighth	3 first, second and third plus 1 fourth-level spell

Brown dragons are 85% likely to be on friendly terms with Pixies,
Sprites, Druids, Pseudo-dragons and Treants that live in the same
forest or nearby.
 

AD&&D	Monster Manual	Dragons	The Dragon #38	Dragon magazine
-	-	Redefining the Dragon