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diff --git a/game/server/hl2/npc_crow.h b/game/server/hl2/npc_crow.h
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+++ b/game/server/hl2/npc_crow.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef NPC_CROW_H
+#define NPC_CROW_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#define BIRDTYPE_CROW 1
+#define BIRDTYPE_PIGEON 2
+#define BIRDTYPE_SEAGULL 3
+
+//
+// Spawnflags.
+//
+#define SF_CROW_FLYING		16
+
+#define CROW_TAKEOFF_SPEED		170
+#define CROW_AIRSPEED			220 // FIXME: should be about 440, but I need to add acceleration
+
+//
+// Custom schedules.
+//
+enum
+{
+	SCHED_CROW_IDLE_WALK = LAST_SHARED_SCHEDULE,
+	SCHED_CROW_IDLE_FLY,
+
+	//
+	// Various levels of wanting to get away from something, selected
+	// by current value of m_nMorale.
+	//
+	SCHED_CROW_WALK_AWAY,
+	SCHED_CROW_RUN_AWAY,
+	SCHED_CROW_HOP_AWAY,
+	SCHED_CROW_FLY_AWAY,
+
+	SCHED_CROW_FLY,
+	SCHED_CROW_FLY_FAIL,
+
+	SCHED_CROW_BARNACLED,
+};
+
+
+//
+// Custom tasks.
+//
+enum 
+{
+	TASK_CROW_FIND_FLYTO_NODE = LAST_SHARED_TASK,
+	//TASK_CROW_PREPARE_TO_FLY,
+	TASK_CROW_TAKEOFF,
+	//TASK_CROW_LAND,
+	TASK_CROW_FLY,
+	TASK_CROW_FLY_TO_HINT,
+	TASK_CROW_PICK_RANDOM_GOAL,
+	TASK_CROW_PICK_EVADE_GOAL,
+	TASK_CROW_HOP,
+
+	TASK_CROW_FALL_TO_GROUND,
+	TASK_CROW_PREPARE_TO_FLY_RANDOM,
+
+	TASK_CROW_WAIT_FOR_BARNACLE_KILL,
+};
+
+
+//
+// Custom conditions.
+//
+enum
+{
+	COND_CROW_ENEMY_TOO_CLOSE = LAST_SHARED_CONDITION,
+	COND_CROW_ENEMY_WAY_TOO_CLOSE,
+	COND_CROW_FORCED_FLY,
+	COND_CROW_BARNACLED,
+};
+
+enum FlyState_t
+{
+	FlyState_Walking = 0,
+	FlyState_Flying,
+	FlyState_Falling,
+	FlyState_Landing,
+};
+
+
+//-----------------------------------------------------------------------------
+// The crow class.
+//-----------------------------------------------------------------------------
+class CNPC_Crow : public CAI_BaseNPC
+{
+	DECLARE_CLASS( CNPC_Crow, CAI_BaseNPC );
+
+public:
+
+	//
+	// CBaseEntity:
+	//
+	virtual void Spawn( void );
+	virtual void Precache( void );
+
+	virtual Vector BodyTarget( const Vector &posSrc, bool bNoisy = true );
+
+	virtual int DrawDebugTextOverlays( void );
+
+	//
+	// CBaseCombatCharacter:
+	//
+	virtual int OnTakeDamage_Alive( const CTakeDamageInfo &info );
+	virtual bool CorpseGib( const CTakeDamageInfo &info );
+	bool	BecomeRagdollOnClient( const Vector &force );
+
+	//
+	// CAI_BaseNPC:
+	//
+	virtual float MaxYawSpeed( void ) { return 120.0f; }
+	
+	virtual Class_T Classify( void );
+	virtual void GatherEnemyConditions( CBaseEntity *pEnemy );
+
+	virtual void HandleAnimEvent( animevent_t *pEvent );
+	virtual int GetSoundInterests( void );
+	virtual int SelectSchedule( void );
+	virtual void StartTask( const Task_t *pTask );
+	virtual void RunTask( const Task_t *pTask );
+
+	virtual bool HandleInteraction( int interactionType, void *data, CBaseCombatCharacter *sourceEnt );
+
+	virtual void OnChangeActivity( Activity eNewActivity );
+
+	virtual bool OverrideMove( float flInterval );
+
+	virtual bool FValidateHintType( CAI_Hint *pHint );
+	virtual Activity GetHintActivity( short sHintType, Activity HintsActivity );
+
+	virtual void PainSound( const CTakeDamageInfo &info );
+	virtual void DeathSound( const CTakeDamageInfo &info );
+	virtual void IdleSound( void );
+	virtual void AlertSound( void );
+	virtual void StopLoopingSounds( void );
+	virtual void UpdateEfficiency( bool bInPVS );
+
+	virtual bool QueryHearSound( CSound *pSound );
+
+	void InputFlyAway( inputdata_t &inputdata );
+	
+	void TraceAttack( const CTakeDamageInfo &info, const Vector &vecDir, trace_t *ptr, CDmgAccumulator *pAccumulator );
+	void StartTargetHandling( CBaseEntity *pTargetEnt );
+
+	DEFINE_CUSTOM_AI;
+	DECLARE_DATADESC();
+
+	int			m_iBirdType;
+	bool		m_bOnJeep;
+
+protected:
+	void SetFlyingState( FlyState_t eState );
+	inline bool IsFlying( void ) const { return GetNavType() == NAV_FLY; }
+
+	void Takeoff( const Vector &vGoal );
+	void FlapSound( void );
+
+	void MoveCrowFly( float flInterval );
+	bool Probe( const Vector &vecMoveDir, float flSpeed, Vector &vecDeflect );
+
+	bool IsDeaf() { return m_bIsDeaf; }
+
+protected:
+	float m_flGroundIdleMoveTime;
+
+	float m_flEnemyDist;		// Distance to GetEnemy(), cached in GatherEnemyConditions.
+	int m_nMorale;				// Used to determine which avoidance schedule to pick. Degrades as I pick avoidance schedules.
+	
+	bool m_bReachedMoveGoal;
+
+	float m_flHopStartZ;		// Our Z coordinate when we started a hop. Used to check for accidentally hopping off things.
+
+	bool		m_bPlayedLoopingSound;
+
+private:
+
+	Activity NPC_TranslateActivity( Activity eNewActivity );
+
+	float				m_flSoarTime;
+	bool				m_bSoar;
+	Vector				m_vLastStoredOrigin;
+	float				m_flLastStuckCheck;
+	
+	float				m_flDangerSoundTime;
+
+	Vector				m_vDesiredTarget;
+	Vector				m_vCurrentTarget;
+
+	bool				m_bIsDeaf;
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: Seagull. Crow with a different model.
+//-----------------------------------------------------------------------------
+class CNPC_Seagull : public CNPC_Crow
+{
+	DECLARE_CLASS( CNPC_Seagull, CNPC_Crow );
+
+public:
+	
+	void Spawn( void )
+	{
+		SetModelName( AllocPooledString("models/seagull.mdl") );
+		BaseClass::Spawn();
+
+		m_iBirdType = BIRDTYPE_SEAGULL;
+	}
+
+	void PainSound( const CTakeDamageInfo &info )
+	{
+		EmitSound( "NPC_Seagull.Pain" );
+	}
+
+	void DeathSound( const CTakeDamageInfo &info )
+	{
+		EmitSound( "NPC_Seagull.Pain" );
+	}
+
+	void IdleSound( void )
+	{
+		EmitSound( "NPC_Seagull.Idle" );
+	}
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: Pigeon. Crow with a different model.
+//-----------------------------------------------------------------------------
+class CNPC_Pigeon : public CNPC_Crow
+{
+	DECLARE_CLASS( CNPC_Pigeon, CNPC_Crow );
+
+public:
+	void Spawn( void )
+	{
+		SetModelName( AllocPooledString("models/pigeon.mdl") );
+		BaseClass::Spawn();
+
+		m_iBirdType = BIRDTYPE_PIGEON;
+	}
+
+	void IdleSound( void )
+	{
+		EmitSound( "NPC_Pigeon.Idle" );
+	}
+};
+
+#endif // NPC_CROW_H