Program when ran does not return any birds

using System.Collections.Generic;
using System.Linq;

namespace BirdWatcher
{
  public class BirdSearch
  {
      public string CommonName { get; set; }
      public List<string> Colors { get; set; }
      public string Country { get; set; }
      public string Size { get; set; }
      public int Page { get; set; }
      public int PageSize { get; set; }
  }

  public static class BirdSearchExtension
  {
      public static IEnumerable<Bird> Search(this IEnumerable<Bird> source, BirdSearch search)
      {
          return source.Where(s => search.CommonName == null || s.CommonName.Contains(search.CommonName))
                       .Where(s => search.Country == null || s.Habitats.Any(h => h.Country.Contains(search.Country)))
                       .Where(s => search.Size == null || s.Size == search.Size)
                       .Where(s => search.Colors.Any(c => c == s.PrimaryColor) ||
                                   search.Colors.Any(c => c == s.SecondaryColor) ||
                                   search.Colors.Join(s.TertiaryColors, 
                                                      sc => sc,
                                                      tc => tc,
                                                      (sc, tc) => (sc)).Any())
                       .Skip(search.Page * search.PageSize)
                       .Take(search.PageSize);
      }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BirdWatcher
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var searchParameters = new BirdSearch
            {
                Size = "Medium",
                Country = "Unnited States",
                Colors = new List<string> { "White", "Brown", "Black" },
                Page = 0,
                PageSize = 5
            };

            Console.WriteLine("Type any key to begin search");

            var birds = BirdRepository.LoadBirds();

            while(Console.ReadKey().KeyChar != 'q')
            {
                Console.WriteLine($"Page: {searchParameters.Page}");

                birds.Search(searchParameters).ToList().ForEach(b =>
                {
                    Console.WriteLine($"Common Name: {b.CommonName}");
                });

                searchParameters.Page++;
            }
        }
    }
}

treehouse:~/workspace$ mcs *.cs -out:Program.exe                                                                                                                
treehouse:~/workspace$ mono Program.exe                                                                                                                         
Type any key to begin search                                                                                                                                    

Page: 0                                                                                                                                                         

Page: 1                                                                                                                                                         
treehouse:~/workspace$