The Birds profile at Discogs.com is a copy-and-paste of my two paragraphs below (since edited slightly).
The Birds were formed in Perth by British musicians Terry Clarke and Brian Curtis who had been together in a touring line-up of West London band The Birds. Both had been in The Clockwork Oranges and joined the UK Birds after the departure of founding members Ron Wood (later of The Faces and The Rolling Stones) and Kim Gardner (later of Ashton Gardner & Dyke).
So not exactly a migration of the UK Birds, as some have assumed. The Perth Birds did cover some tracks by the UK Birds: No Good Without You (the B-side of I Can’t Let Maggie Go) and Say Those Magic Words, also on Clarion
Suggestion from Andrew Ainsworth.
Track on Conmocion, the band’s third LP, on RCA. The title is in Spanish, but the lyrics are in the original English.
Formerly a quartet, Los In were now a trio: Amadeo Álvarez (vocals), Richard Green (bass, keyboards), Osvaldo López (drums).
References: 1. Band history by Mario Antonelli, from The Magic Land: A guide to Beat, Psychedelic and Progressive Rock music between 1966 & 1977 in Argentina and Uruguay [archived page]. 2. More details at ArtistInfo and Red Poyote.
There is speculation at 45cat.com that Sons Of Ginza was a one-off studio band, possibly consisting pretty much of Buzz Cason and Mac Gayden. That seems plausible, and I have wondered the same about another Cason–Gayden project, Saturday Morning Cartoon Show: see under Obscure Originators.
Some other 60s-70s recordings, from the files of 45cat.com:
• Jenny Maynard Portugal 1969 EP on Alvorada Internacional
• J. Vincent Edwards UK 1974 45 on Fontana
Honeybus was a melodic, harmonic band with high production values that never achieved the popularity it deserved. Formed by Pete Dello (born Peter Blumson) and Ray Cane (Raymond Byart), who first played together in Grant Tracey & The Sunsets (see Cry Of The Wild Goose).
I Can’t Let Maggie Go, arranged with oboe, bassoon and cor anglais, was Honeybus’s only UK hit. Their song (Do I Figure) In Your Life (1967) is familiar in the version by Joe Cocker. Both of those songs were written by Pete Dello, who left the band during 1968.