River Thames, Purfleet,
Essex, England 51º
28' 52.62'' N 00º 13' 56.11"' E 29 January 2023
Calls from a
winter foraging flock of 10+ birds in sparse hawthorn
scrub.
Two call
types in this recording, probably both used in alarm
as the flock passed through an exposed area:
[top] sirett phrase
begining with brief high-pitched
elements (6.2-8.9 kHz) followed by a lower-pitched
dry rattle composed of a broadband trill of 5-9 elements
(spanning 1.7-7.3 kHz).
[bottom]
si-si-si-si phrases of varying length composed
of up-and-downslurred elements (6.0 -7.5 kHz).