| in Did You Know Facts
Beluga whales have a low dorsal ridge but no dorsal fins.
![Beluga](https://assets.shortpedia.com/uploads/2022/12/30/1672397784.webp?tr=w-1200,h-600,cm-pad_resize,bg-F3F3F3)
Beluga whales have a low dorsal ridge but no dorsal fins. Less surface area can be used to lose heat to the environment because there is no dorsal fin. A beluga may also more easily swim beneath large ice sheets and find breathing holes without a dorsal fin.