Luis is doing research on his favorite big cat the lion which of the following sources would be the most effective
1. A scientific journal article titled "Behavior and ecology of African lions" written by renowned wildlife biologists.
2. An encyclopedia article on lions from a reputable source like Britannica or National Geographic.
3. A blog post written by a self-proclaimed lion enthusiast with no credentials or expertise in the field.
4. A YouTube video titled "Cute lion cub compilation" uploaded by an unknown user.
The most effective source would be option 1, a scientific journal article written by wildlife biologists. This source is likely to provide accurate and comprehensive information about the behavior and ecology of lions, backed up by research and evidence.