Synopsis
Daphne and Barbara are so similar because they are clones, two people who have exactly the same genetic makeup. When their mother was pregnant, her fertilised egg split into two, creating two identical cells that grew into Daphne and Barbara.
Similar broadcast resources

The invasive chameleons of Hawaii | Earth's Tropical Islands
Invasive species like these chameleons are a threat to the native wildlfe of Hawaii.

Cockatoos | Australia: Earth's Magical Kingdom
A parrot finds a tree hollow to lay her eggs in, the hollow is dry and out of reach from predators. The cockatoos also want to use the hollow for nesting and fight the parrot.