This video from Britain says about itself:
Flock of Siskins in My Garden
The siskin is a small, lively finch, which is smaller than a greenfinch. It has a distinctly forked tail and a long narrow bill. The male has a streaky yellow-green body and a black crown and bib. There are yellow patches in the wings and tail. Siskins are mainly a resident breeder from southern England to northern Scotland, but is most numerous in Scotland and Wales. Many breeding birds are residents; in winter birds arrive here also from Europe.
Filmed on 10th June 2012 in Camborne
Video Produced by Paul Dinning – Wildlife in Cornwall
We had seen siskins at the other side of the house, but not on this side yet.
Probably, the siskins will migrate further to the north soon. The rather cold March weather may have kept them here for a little longer.