MAP 2 : The standard grid based Atlas distribution of Ashy Starling and Yellow-vented Bulbul.

MAP 2 : The standard grid based Atlas distribution of Ashy Starling and Yellow-vented Bulbul.

The Yellow-vented Bulbul Pycnonotus barbatus is the most widespread species in Tanzania. It occurs in every square in every month. Lack of data for this species in any month in any square is indicative of poor / no coverage. The presence of this species in any month in any square is indicative of a visit to that square in that month.
When combined with presence for a well known species such as Ashy Starling the data produces a map that suggests NEGATIVE DATA for the species one is concerned with. As the Atlas database continues to grow and eliminates all the YvB month gaps the reliability of this NEGATIVE DATA will increase.