My 1 year old Jenday conure Mango has been pulling out his feathers. I took him to the vet and they said he may have sleep deprivation as everyone in my house is awake at all different hours. I switched his room and put him to bed early but he has continued to pull out his feathers. What concerns me is that the feathers he pulls out are growing in and have a black wet 'gook' on the ends. When they dry the ends look matted. Does anyone know if this is normal since the feathers are not yet fully developed or could this be more serious. Thanks.