安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Quora - A place to share knowledge and better understand the . . .
We would like to show you a description here but the site won’t allow us
- Population (Abundance) Estimates - IWC
Estimates of current population size, known as abundance estimates, are derived from a combination of fieldwork and computer modelling Vessel-based and aerial sighting surveys, acoustic monitoring, and analysis of individual animal markings are techniques used independently or in conjunction with each other to count whales
- The status of African elephants | Magazine Articles | WWF
Five years ago, researchers in Africa undertook a mammoth task: counting the continent’s elephants The Great Elephant Census spanned 18 countries and 295,000 miles, making it the largest, most comprehensive survey of African elephants ever
- Five Years of Network Ratings Declines, Explained
In the 2014-15 TV season, the five English-language broadcast networks drew a combined 35 8 million viewers in primetime, along with a 9 6 rating in the key ad-sales demographic of adults 18-49
- Fauna - Pench Tiger Reserve
* Figures for 2006 and 2010 are for the Pench landscape that includes Pench Maharashtra ** 2011, 2013, 2014, 2015 Tiger figures are minimum number of tigers found in the Core Area during yearly camera trap exercise
- Chinook Salmon | US EPA - U. S. Environmental Protection Agency
One of the objectives of hatcheries is to preserve remaining depleted salmon populations by raising and then releasing extra Chinook salmon smolts into the wild However, hatchery salmon can have negative impacts on wild salmon populations, including loss of natural population identity, diminished adaptability, and interference with natural
- Tiger - San Diego Zoo Animals Plants
When people move into areas where tigers live, tigers are forced into smaller and smaller areas where there may not be enough food for the big cats to survive Conservation scientists estimate that there are no more than 4,500 tigers in the world But there is a lot of work being done to make sure that tigers will survive
|
|
|