On the surface, this is true, industrialized countries indeed have lower fertility.

No wonder their first several generations had been of low fertility.

In fact, about 20% to 30% of the time, a man's low fertility is the main obstacle to conception.

Spanish women - having just 1.15 babies each - have the lowest fertility in the world.

Couples remaining later in the study are, on average, of lower fertility.

Developed countries usually have a much low fertility rate due to greater wealth, education, and urbanization.

"It's not like the Cubans, who have low fertility and no growth from the outside."

The recovery efforts are hampered especially by low fertility of the remaining birds.

The book deals with the consequences of continued low fertility in Sweden.