Question: Bubble-net feeding is a unique and complex feeding behavior engaged in by what animal, that has a distinctive body shape, with long pectoral fins and a knobbly head?

<P0-S0>  They possess the same cartilaginous skeleton seen in sharks but are considered holocephali to distinguish them from the shark and ray categorization. <P0-S1>  In addition to its utilization for feeding, the trunk of the Callorhinchus fish can sense movement and electric fields, allowing them to locate their prey. <P0-S2> The Callorhinchidae (sometimes spelled "Callorhynchidae"), or plough-nose chimaeras, are a family of marine fish containing one genus, Callorhinchus. <P0-S3>  Because of this, it has been proposed to be used for entire genome sequencing to represent the cartilaginous fish class. <P0-S4>  They are found in muddy and sandy substrates of the ocean bottom, where they filter feed, with small shellfish making up the bulk of their diet. <P0-S5>  They are considered to resemble a cross between a shark and a ray or skate, but can be distinguished from sharks because they possess an operculum over their gill slits. <P0-S6>  They also have two dorsal fins spaced widely apart, which help identify the species in the open ocean. <P0-S7>  Phylogenetically, they are the oldest group of living jawed Chondrichthyes. <P0-S8>  The mouth is just under this snout and the eyes are located high on top of the head. <P0-S9>  Because of this, they provide a useful research organism for studying the early development of the jawed characteristic. <P0-S10>  They have broad flat teeth that have adapted for this type of eating habit, two pair that reside in the upper jaw and one pair in the lower jaw. <P0-S11>  The snout is used to probe the sea bottom in search of the invertebrates and small fishes on which it preys. <P0-S12>  Many classify the Callorhinchidae as a chimeric species due to their shared characteristics of both the sharks and rays. <P0-S13>  Additionally, their skin is smooth, not covered in tough scales, characteristic of the shark. <P0-S14>  The remainder of the body is flat and compressed, often described as elongated. <SEP> <P1-S0> The humpback whale ("Megaptera novaeangliae") is a species of baleen whale. <P1-S1>  One of the larger rorqual species, adults range in length from 12 - and weigh about 36000 kg . <P1-S2>  It is known for breaching and other distinctive surface behaviors, making it popular with whale watchers. <P1-S3>  Males produce a complex song lasting 10 to 20 minutes, which they repeat for hours at a time. <P1-S4>  The humpback has a distinctive body shape, with long pectoral fins and a knobbly head. <P1-S5>  Its purpose is not clear, though it may have a role in mating. <SEP> <P2-S0> Asterolepis is an extinct genus of antiarch placoderms from the Devonian of North and South America and Europe. <P2-S1>  They were heavily armored flat-headed benthic detritivores with distinctive jointed limb-like pectoral fins and hollow spine. <P2-S2>  The armor plate gives the "Asterolepis" a box-like shape. <P2-S3>  Its pectoral fins are also armored but the caudal and dorsal fin are not. <P2-S4>  The first fossils were named by M. Eichwald in 1840 after noticing star-like markings on the fossils. <SEP> <P3-S0>  It is one of the few surface feeding behaviors that humpback whales are known to engage in. <P3-S1> Bubble-net feeding is a unique and complex feeding behavior engaged in by Humpback whales (Megaptera novaeangliae) and Bryde's whales in Gulf of Tosa (), Japan. <P3-S2>  This type of feeding is often done in groups. <P3-S3>  The group size can range from a minimum of two or three whales participating and up to sixty at one time. <P3-S4>  Whales can also perform a similar method of surface feeding called lunge feeding but is done solo.