After a whale has come to the surface and taken a breath, the body rounds out and the dorsal fin shows very clearly as it does a peduncle arch.
The unique dorsal fin of a pygmy blue whale.
This pygmy blue whale has a distinctive hooked dorsal fin with a barnacle hanging off the tip!
Here are three humpback whales their dorsal fins showing clearly as they are about to arch and lift their flukes.
Here is a close-up view of the dorsal fin, mid-peduncle arch.
At least 6 humpback whales are doing or about to do a peduncle arch in this photo.
Among the blows, these three humpbacks are just about to do peduncle arches.
Another winner!
More nice peduncle arches in this lot!
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