| The photo below was taken in attempts to show the powder down feathers which outline the furcular hollow and are unique to herons and bitterns. |
| Leighton Moss, a premier RSPB reserve where you can hear bitterns boom, is a lovely walk away over the crag. |
| And Doncaster will hopefully soon be ringing with the boom of bitterns crying out for mates. |
| He reported that bitterns were beginning to practise their boom on the reserve again but would not find their full voice until April or May. |
| Three poachers were caught red-handed trying to lure watercocks and yellow bitterns by using a recording of a bird's mating call here yesterday. |
| The date of the first booming bitterns varies each year, although there has been a trend towards them starting to boom earlier in recent years. |
