IUCN Red List and BirdLife International have updated threatened status of bird species every year. Below are the update relating to Hong Kong birds.
Christmas Frigatebird: Critically Endangered to Vulnerable
https://www.iucnredlist.org/species/22697742/210923623
Sharp-tailed Sandpiper: Least Concern to Vulnerable
https://www.iucnredlist.org/species/22693414/152588591
Black-capped Kingfisher: Least Concern to Vulnerable
https://www.iucnredlist.org/species/22683249/212490546
Yellow Bunting: Vulnerable to Least Concern
https://www.iucnredlist.org/species/22720996/154686501
It is also worthy to mention two special bird species in China:
Streaked Reed Warbler: Endangered to Critically Endangered
https://www.iucnredlist.org/species/22714704/154735033
Rusty-throated / Przewalski’s Parrotbill: Vulnerable to Least Concern
https://www.iucnredlist.org/species/22716818/210228016
國際自然保護聯盟及國際鳥盟剛剛更新部分瀕危鳥類狀況，有四種在香港出現的鳥種有瀕危級別的改變：
白腹軍艦鳥：極度瀕危降到易危
https://www.iucnredlist.org/species/22697742/210923623
尖尾濱鷸：無危升到易危
https://www.iucnredlist.org/species/22693414/152588591
藍翡翠：無危升到易危
https://www.iucnredlist.org/species/22683249/212490546
硫磺鵐：易危降到無危
https://www.iucnredlist.org/species/22720996/154686501
同時值得一提的是，在中國有兩種很特別的鳥種也有瀕危級別的改變：
細紋葦鶯：瀕危升到極度瀕危
https://www.iucnredlist.org/species/22714704/154735033
灰冠鴉雀：易危降到無危
https://www.iucnredlist.org/species/22716818/210228016
