Siskin (Carduelis spinus)
Like their close relative, the Greenfinch (and both are relatives of the Canary), Siskins are ravenous seed eaters and the tendency nowadays is to put out seed rather than peanuts or bread for birds which may well account for this up turn in numbers.
If you have a feeding station that does not have little perches you will notice that the Siskin has a definite preference for eating upside down! This is because it has to point downwards to get at seeds in fir cones in its normal habitat, coniferous forest.
Living not too far from Wareham forest where Siskins nest they are frequent visitors to our garden and at their peak we had nine at one sitting last spring and it was well into June before they stopped coming in.