Rare white giraffes killed by poachers in Kenya
Rangers had found the carcasses of the female and her calf in a village in north-eastern Kenya's Garissa County.
A third white giraffe is still alive. It is thought to be the only remaining one in the world, the conservationists added.
Their white appearance is due to a rare condition called leucism, which causes skin cells to have no pigmentation.
News of the white giraffes spread across the world after they were photographed in 2017.
The manager of the Ishaqbini Hirola Community Conservancy, Mohammed Ahmednoor, said the two killed giraffes were last spotted more than three months ago.
"This is a very sad day for the community of Ijara and Kenya as a whole. We are the only community in the world who are custodians of the white giraffe," Mr Ahmednoor said in a statement.