Atlantic puffins, along with a few other U.K. birds, will be moved to "Vulnerable" on the International Union for Conservation of Nature's (IUCN) "Red List" of Threatened Species, BBC reports.
Joining the puffins in the unfortunate "upgrade" to vulnerable for U.K. bird species will be European turtle doves, Slavonian grebes, and pochards.
"The erosion of the U.K.'s wildlife is staggering and this is reinforced when you talk about puffin and turtle dove now facing the same level of extinction threat as African elephant and lion, and being more endangered than the humpback whale," bird conservation expert Martin Harper told BBC.
There are still plenty of puffins, which number in the millions, but their sources of food are becoming harder to come by and they are endangered by pollution events such as oil spills.
European turtle doves, meanwhile, have seen an unexplained drop in breeding pairs and have declined by nearly one third in the last 16 years.
The news comes as IUCN begins updating for 2015 its worldwide database of animals that are at varying degrees of risk for extinction. Those changes also brought this week's news that more than half of Africa's vultures could disappear, thanks to widespread poisoning and targeting by poachers.