Yes.
some said one can just use the zoom function of the camera
Don't listen to him! He obviously doesn't know what he's talking about.
it's either you try to take pictures with your camera and don't use the binoculars that much, or vice versa.
That's right! And I'd rather use the binoculars, than waste my time for taking mediocre pictures.
Let's face it, you can't make as good pictures as professional photographer. Not to say don't take any photos, but you'll have a much better time just watching the animals and most of the time you need good binoculars.
Buy one that is good quality, but a compact size and you'll continue to use it on your travels.
I've never been to Africa on a safari, but I often take my binoculars on my trips, especially for hiking.
I see you're from Germany so you don't have to look far for good quality binoculars, while supporting your own countries workers! :-)
Deutsche! Wehrt euch! Kauft nicht bei Chinesen! :-)
http://www.zeiss.de/sports-optics/de_de/jagd/fernglaeser.html
"Carl Zeiss Sports Optics division produces rifle scopes, spotting scopes, binoculars, and distance measuring devices for outdoors enthusiasts. The two main product lines are the Conquest line, which is manufactured in Germany and assembled in the United States, and Victory line, which is produced entirely in Germany. Zeiss Sports Optics are revered among the best in the world, and are utilized by military and law enforcement agencies in countries around the world."