A classic example of natural selection at work is the origin of giraffes’ long necks. The ancestors of modern giraffes were animals similar to deer or antelope, with necks of ordinary length.

Namibia is a top safari destination partly due to its dramatic landscapes. With a new safari, travelers can explore three of those and also work to help giraffes.

Six zebras wore video cameras attached to collars, capturing the equines’ daily life. Sticking with giraffes may let the two species protect each other.

but it takes a different approach to natural selection. Lamarckism proposes that animals acquire characteristics based on use or disuse during their lives, rather than through hard-coded genetic ...