Yes, they can be. Not only gray, black and white but pink as well. Pink dolphin is the common name of The Amazon river dolphin (Inia geoffrensis), that lives in Amazon, Orinoco and Araguaia rivers. It is an endangered specie due to pollution according to International Union for Conservation of Nature.
Recommended Books on How to be an Effective Communicator: 1  The Leader as Communicator: Strategies and Tactics to Build Loyalty, Focus Effort, and Spark Creativity. 2  Stand and Deliver: How to Become a Masterful Communicator and Public Speaker. 3  10 Simple Secrets of the Worldâs Greatest Business Communicators.
Communications Skills: To be in effective engineer you must have the ability to communicate, both in writing and orally. Focus on your writing skills, consider developing a competency in a second language and also develop your public speaking skills. A good communicator has influence and most importantly, gets noticed.