Prince William and Kate Bottle Feed Animals on Wildlife Mission to Preserve Endangered Animals

— -- Prince William and Kate enjoyed the highlight of their visit to India so far today at the Kaziranga National Park in Assam. The royal couple smiled from ear to ear as they bottle fed baby rhinos and elephants on day four of their visit to India and Bhutan.

The animals fed by the royal couple are being nursed back to health after being injured, displaced or orphaned in the wild. The Duke and Duchess of Cambridge visited Kaziranga National Park on a mission to highlight the plight of the one-horned rhino.

The wildlife park, located in Assam, India, is where two-thirds of the world's one-horned rhinos, an endangered species, make their home.

Kate and William are touring India without their two young children, Prince George and Princess Charlotte. The duke and duchess brought Prince George with them on their 2014 tour of Australia but left George and his sister at home in the U.K., where they are being looked after by their nanny and Kate's parents, Carole and Mike Middleton.

Kate, 34, told one of the tribal elders in a local village in the jungles of northeastern India that she was missing George and Charlotte. The duchess also remarked that watching the little girls in the village dancing around reminded her of Princess Charlotte, who will turn one on May 2.

Kate also admitted that George was "too naughty" and would be "running around all over the place" if they'd brought him along to India and Bhutan.

Earlier in the day, Kate, wearing a pair of Zara skinny jeans with her hair loose, and William were up at dawn to enjoy a romantic safari watching elephants and the coveted rhino in their natural environment.

Followed by a pack of royal photographers, the duchess, an amateur photographer herself, tracked the wildlife with binoculars and took pictures for her private collection.

William has been an outspoken advocate of anti-poaching efforts. While in India, the duke plans to meet with rangers who are doing everything they can to preserve the rhino population.

In the area where William and Kate are visiting, six rhinos have been killed in the past year and just last week, before the royal couple arrived, another rhino was killed for its horn.

Rhinos are in particular danger as demand in other parts of Asia for their horns continues to rise. Traffickers in Southeast Asia are now marketing Indian rhino horn as "fire horn" and touting its alleged potency.

Later today, the future king and queen of England will travel to the village of Borjuri to visit the Center for Wildlife Rehabilitation and Conservation, which provides emergency care and rehabilitation to wild animals that have been injured, displaced or orphaned.

Prince William and Kate are also anxious to talk to the locals. The couple will meet with families who have been relocated from villages in order to safeguard the natural habitat of elephants.