Most people size up animals by how tall they stand or how long they stretch, but weight tells a different story. Measuring by mass alone reveals which creatures carry the most bulk.

CAPE TOWN, South Africa — When it comes to the niche business of moving elephants, Dr. Amir Khalil and his team might be the best. The Egyptian veterinarian's résumé includes possibly the most famous ...

Over the last decade, Argentina has been closing its zoos and relocating animals to sanctuaries and rescue centers. But moving elephants has proved harder than expected.