John E G Kemp:
Sand Martin UK (= Bank Swallow USA)
John E G Kemp:
Sand Martins
John E G Kemp:
Nesting Sand Martins (Bank Swallows)
John E G Kemp:
Sand Martin removing fecal sac from nest
John E G Kemp:
Sand Martins
John E G Kemp:
Sand Martins
John E G Kemp:
Sand Martin