see: urw_msg.txt
.DO_TREECLIMB.(who)
[*:<npc_desc> climbs up into a tree.]
[HEAR:You hear branches rustling in the [IN_DIR:<npc_direction>].]
.DO_LAND.(who)
[*:<npc_desc> lands down.]
[HEAR:You hear rustle of wings from the [IN_DIR:<npc_direction>].]
.DO_FLY.(who)
[*:<npc_desc> flies up into the air.]
[HEAR:You hear rustle of wings from the [IN_DIR:<npc_direction>].]
.DO_DIVE.(who)
[*:{splash}<npc_desc> dives under the water.]
[HEAR:{splash}You hear a splash from the [IN_DIR:<npc_direction>].]
.DO_DROP_DOWN.(who)
[*:<npc_defdesc> drops down on the ground.]
[HEAR:You hear a thud from the [IN_DIR:<npc_direction>].]