public override string ToString()
        {
            StringBuilder output  = new StringBuilder();
            string        shortId = $"{this._id.ToString().Substring(this._id.ToString().Length - 6)}";


            List <TypeCounter> AnimalCount = (
                from chicken in Chickens
                group chicken by chicken.Type into AnimalType
                select new TypeCounter
            {
                Type = AnimalType.Key,
                Counter = AnimalType.Count()
            }
                ).ToList();

            output.Append($"Chicken house ( ");
            foreach (TypeCounter animal in AnimalCount)
            {
                output.Append($"{animal.Counter} {animal.Type} ");
            }
            output.Append($")\n");

            return(output.ToString());
        }