1.   For instance, researchers have barely begun studying whether elevated levels of dioxin and other contaminants could explain the low reproductive rates of Maine bald eagles.

2.   Hutchison said the small range and slow reproductive rate made the salamander vulnerable to urban pollution.

3.   Mathematica has been used to study reproductive rates of sea lions in western Alaska and to develop a new model for derivatives trading by a securities company.

4.   Research has shown low reproductive rates among humpbacks in these waters.

5.   Studies made of the northern European seals disclosed that their reproductive rate and immune systems were adversely affected by a controlled diet heavy on fish contaminated with PCBs.

6.   With only one female per pack giving birth each year, the reproductive rate is not high.

7.   Pandas have a low reproductive rate, and Hsing-Hsing and Ling-Ling never produced a healthy baby.

8.   Bats have a low reproductive rate of about one baby per year, said Tim Snow, a non-game specialist for Arizona Game and Fish.

9.   Experts say her reproductive rate is twice that of South China tigers in zoos around the country.

10.   Obesity among captive pandas is one reason they have low reproductive rates.