public IEnumerable <Bird> GetBirds(Enums.UnitOfMeasurement unitOfMeasurement = Enums.UnitOfMeasurement.Milliarchieops)
        {
            var         birdsData  = _birdRepository.GetBirds();
            var         birdsModel = birdsData.Select(BirdDto.FromBirdDataToBirdModel);
            double      umTimes    = _unitOfMeasurementService.ConvertUnit(unitOfMeasurement);
            List <Bird> list       = new List <Bird>();
            var         birds      = birdsModel as IList <Bird> ?? birdsModel.ToList();

            foreach (var bird in birds)
            {
                list.Add(bird);
            }
            list.ForEach(b =>
            {
                b.Height = Math.Round(b.Height * umTimes, 2);
                b.Length = Math.Round(b.Length * umTimes, 2);
                b.Girth  = Math.Round(b.Girth * umTimes, 2);
            });
            return(birds);
        }