In this handout photo released by Humane World for Animals, a chimpanzee formerly used in research receives a comprehensive health check at a retirement sanctuary for chimpanzees, in Bapakwali, Liberia, Tuesday, Aug. 25, 2026. (Humane World for Animals via AP)

In this handout photo released by Humane World for Animals, a chimpanzee formerly used in research receives a comprehensive health check at a retirement sanctuary for chimpanzees, in Bapakwali, Liberia, on Aug. 25, 2026. (Humane World for Animals via AP)

In this handout photo released by Humane World for Animals, a chimpanzee formerly used in research receives a comprehensive health check at a retirement sanctuary for chimpanzees, in Bapakwali, Liberia, on Aug. 25, 2026. (Humane World for Animals via AP)

In this handout photo released by Humane World for Animals, a chimpanzee formerly used in research receives a comprehensive health check at a retirement sanctuary for chimpanzees, in Bapakwali, Liberia, on Aug. 25, 2026. (Humane World for Animals via AP)

A two-month-old female Sumatran tiger cub observes the Attica Zoological Park near Athens, Greece, on Tuesday, Sept. 8, 2026, after its first vaccination and microchipping, as part of an effort to build a backup population of the critically endangered species. (AP Photo/Thanassis Stavrakis)

A two-month-old female Sumatran tiger cub growls after its first vaccination and microchipping at Attica Zoological Park near Athens, Greece, on Tuesday, Sept. 8, 2026, as part of an effort to build a backup population of the critically endangered species. (AP Photo/Thanassis Stavrakis)

Veterinarian Arsinoi Psaroudaki, right, gives a two-month-old Sumatran male tiger cub a first vaccination and microchipping, as mamal curator Antonis Balas holds the animal at Attica Zoological Park near Athens, Greece, on Tuesday, Sept. 8, 2026, as part of an effort to build a backup population of the critically endangered species. (AP Photo/Thanassis Stavrakis)

Two male two-month-old Sumatran tiger cubs receive their first vaccination and are microchipped at Attica Zoological Park near Athens, Greece, on Tuesday, Sept. 8, 2026, as part of an effort to build a backup population of the critically endangered species. (AP Photo/Thanassis Stavrakis)