Todd Pusser / Female Dense beaked whales {Mesoplodon densirostris} underwater, Caribbean.

Todd Pusser / Female Dense beaked whale {Mesoplodon densirostris} surfacing, Bahamas, Caribbean.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris). Punta Rasca, Tenerife. The yellow patches are caused by the presence of microalgae.

Sergio Hanquet / Gervais' beaked whale (Mesoplodon europaeus) El Hierro, Canary Islands.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) hoisted in air, prior to necropsy to determine reason for death. Tenerife, Canary Islands. 2015.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) washed up dead on beach, man standing in water looking at whale, prior to necropsy to determine reason for death. Tenerife, Canary Islands. 2015...

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) blowhole and beak at water surface. El Hierro, Canary Islands.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) dorsal fin at surface. El Hierro, Canary Islands.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) male, dorsal fin and scars on body. El Hierro, Canary Islands.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) male, blowhole and beak, scars on body. El Hierro, Canary Islands.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) male, blowhole and scars on body. El Hierro, Canary Islands.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) male, scars on body visible above water surface. El Hierro, Canary Islands.

Rebecca Robinson / Illustration of the dive sequence of Andrew's beaked whale (Mesoplodon bowdoini).

Rebecca Robinson / Illustration of the dive sequence of Ginkgo-Toothed Beaked Whale (Mesoplodon ginkgodens).

Rebecca Robinson / Illustration of the dive sequence of Stejneger? Beaked Whale (Mesoplodon stejnegeri).

Rebecca Robinson / Illustration of the dive sequence of Pygmy Beaked Whale (Mesoplodon peruvianus).

Rebecca Robinson / Illustration of the dive sequence of Perrin? Beaked Whale (Mesoplodon perrini).

Rebecca Robinson / Illustration of the dive and breach sequence of Gray? Beaked Whale (Mesoplodon grayi).

Rebecca Robinson / Illustration of the diving behaviour of a Sowerby's Beaked Whale (Mesoplodon bidens).

Rebecca Robinson / Illustration of the diving behaviour of a Strap-Toothed Whale (Mesoplodon layardii).

Rebecca Robinson / Illustration of the diving behaviour of True? Beaked Whale (Mesoplodon mirus).

Rebecca Robinson / Illustration of the blow and diving behaviour of Gervais?Beaked Whale (Mesoplodon europaeus).

Rebecca Robinson / Illustration of Deraniyagala? beaked whale (Mesoplodon hotaula).

Rebecca Robinson / Illustration of the surface profile with blow and diving behaviour of Hubbs?Beaked Whale (Mesoplodon carlhubbsi).

Rebecca Robinson / Illustration of the surface profile with blow and diving/breaching behaviour of Hector? Beaked Whale (Mesoplodon hectori) male.

Rebecca Robinson / Illustration of Blainville? Beaked Whale / Atlantic Beaked Whale (Mesoplodon densirostris) surface profile with blow and dive sequence.

Rebecca Robinson / Illustration of Deraniyagala's beaked whale (Mesoplodon hotaula) surface profile with calf.

Rebecca Robinson / Illustration of a female Spade-toothed Whale (Mesoplodon traversii)

Martin Camm / Carwardine / Illustration of True's beaked whale (Mesoplodon mirus) male, Ziphidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of True's beaked whale (Mesoplodon mirus) female, Ziphidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Strap-toothed / Layard's beaked whale (Mesoplodon layardii) Ziphidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Stejneger's / Bering Sea / North Pacific beaked whale (Mesoplodon stejnegeri) male, Ziphidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Sowerby's Beaked Whale (Mesoplodon bidens) female, Ziphidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Peruvian Beaked / Pygmy Beaked / Lesser Beaked / Bandolero Beaked Whale (Mesoplodon peruvianus) male, Ziphidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Peruvian Beaked / Pygmy Beaked / Lesser Beaked / Bandolero Beaked Whale (Mesoplodon peruvianus) female, Ziphidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Perrin's Beaked Whale (Mesoplodon perrini) Ziphidae; first found in May 1975 off California (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Sowerby's / North Sea / North Atlantic beaked whale (Mesoplodon bidens) dive sequence. Surface profile, (Wildlife Art Company).

Martin Camm / Carwardine / Hubbs' / Arch beaked whale (Mesoplodon carlhubbsi) Ziphiidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Hector's / New Zealand beaked whale (Mesoplodon hectori) male, Ziphiidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Gray's beaked whale (Mesoplodon grayi) Haast's beaked whale; male, Ziphiidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Gray's / Haast's beaked whale (Mesoplodon grayi) Ziphiidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Ginkgo-toothed beaked whale (Mesoplodon ginkgodens) Ziphiidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of male Gervais' beaked whale (Mesoplodon europaeus) Gulf Stream beaked whale; Ziphiidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Gervais' Beaked Whale / Gulf Stream Beaked Whale (Mesoplodon europaeus) female, Ziphiidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of skull of Bahamonde's beaked whale (Mesoplodon traversii) Spade-toothed whale, Ziphidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Andrew's / Bowdoin's Beaked Whale (Mesoplodon bowdoini), Ziphidae (Wildlife Art Company).