Eurasian Siskin
Spinus spinus
The siskin is a small, short-tailed bird, 11–12.5 centimetres (4.3–4.9 in) in length with a wingspan that ranges from 20 to 23 centimetres (7.9 to 9.1 in). It weighs between 12 and 18 grams (0.42 and 0.63 oz). The bird shows sexual dimorphism. The male has a greyish-green back, a yellow rump, yellow sides to the tail with a black tip, black wings with a distinctive yellow wing stripe, a yellowish breast that becomes whiter and striped towards the cloaca, a black bib (or chin patch) and two yellow auriculas and a black cap on its head. Voice: This bird has two calls, both powerful but conflicting, one is descending and the other is ascending, their onomatopoeic sounds can be represented as "tilu" and "tluih". On occasions they also issue a harsh rattling chirrup. Like other finches, the song is a smooth, rapid twitter and trill of long duration, occasionally interrupted by stronger or shorter syllables.
ID text from Wikipedia, CC BY-SA 4.0
Hooded Siskin
Spinus magellanicus
The hooded siskin is 10 to 12 cm (3.9 to 4.7 in) long. and weighs about 11 g (0.39 oz). The species is sexually dimorphic. Adult males of the nominate subspecies S. m. magellanicus have an entirely black head, throat, and upper breast. They have a bright yellow collar on the nape and the sides of their neck. Their lower nape, back, and scapulars are olive green with faint dark streaks. Their rump is bright yellow and their uppertail coverts are olive green. Their tail is mostly black with wide deep yellow edges on all but the innermost pair of feathers. Their wings have a complicated pattern. Voice: The hooded siskin typically sings from an open perch and also in flight; it sings for long periods. Its song is "a varied series of rapid short twittering tseet-tseet, tseet-weet, or tseet-weet-a-weeta interspersed with repeated phrases; several males often sing in concert". Its calls include "a light or lilting djey, djey; tseeu; and a long trilling trrrrrr".
ID text from Wikipedia, CC BY-SA 4.0
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