Rare footage captures photo of the world's most threatened Javan rhino. See baby photos below.

Rare footage captures photo of the world's most threatened Javan rhino. See baby photos below.

In these undated frame grabs released by WWF-Indonesia and Ujung Kulon National Park Authority, a female Javan rhino walks with her calf in Ujung Kulon National Park. Four of the world’s most rare rhinoceroses were captured by camera traps installed in an Indonesian national park, an environmental group said Monday, Feb. 28, 2011.

JAKARTA, Indonesia – Four of the world’s most rare rhinoceroses were captured by camera traps installed in an Indonesian national park, an environmental group said Monday.

The footage from movement-triggered hidden cameras showed two mother Javan rhinos and two calves in Ujung Kulon National Park in November and December last year, said a release from the WWF-Indonesia.

Javan rhinos are one of the world’s most endangered species with an estimated population of no more than 50 in Ujung Kulon. A few others live in Vietnam’s Cat Tien National Park.  Read more here.