Category: Cetaceans

Southern (Antarctic) Minke whale

Antarctic (Southern) Minke whale

Bizarrely, having been described in the 1850s it was not recognized as a separate species until the 1990s. Thankfully, largely ignored by whalers, it came out of the whaling age with a population that still numbered in the hundreds of thousands – with current estimates falling around half a million individuals.

The Antarctic and the Southern Minke whales are thought to have diverged around 4.7 million years ago. They are found throughout much of the Southern hemisphere.

They are the main prey item for type A killer whales, with multiple occasions this hunt having been watched. There has been a recorded occasion when a group of 10 type B killer whales also killed one of these whales.

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Common Minke

Common Minke Whale

The smallest species of rorquals and second smallest baleen whales in the ocean. It was originally ignored, a primary target of whalers in the Southern hemisphere. Also known as the Northern minke whales, it lives in the Southern hemisphere, but is not the Southern Minke as that one lives in the waters around the Antarctic. Its range expands far into the northern hemisphere, up into arctic waters.

Hybrids of the 2 species have been found on several occasions, and it appears that the offspring are fertile – whether this is a threat to the two species as climate change pushes them further together.

It is odd that the common minke whale is also known as the Northern minke whale, as there is a Northern Minke whale which is found in the northern hemisphere.

Links will appear below.

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Grey whale

A grey whale breaching: An incredible sight, and the sound travels a very long way in water

Grey whale

The gray whale (other names include grey whale, gray back whale, Pacific gray whale, Korean gray whale, or California gray whale), is a baleen whale that migrates between feeding and breeding grounds yearly. They can reach 14m in length and 41 tonnes. It is found in North pacific – with the Northeast Pacific (American population) and the Northwest Pacific (Asian population) that is endangered. The northern population has been extinct for a long time.

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Sperm whale

Also known as the Cachalot is both the largest toothed whale and largest toothed predator. It is found around the world. They have no natural predators, though both young and the weakened elderly are sometimes taken by pods of killer whales.

Growing up to 16m in length and with a head 5m long, they can dive to depths of 2250m, and have been timed staying under for 2 hours at a time. They live for around 70 years.

They have a substance called Ambergris which is highly valued in the perfume industry, and beach-combers often find this on the beach.

Males grow to 45 tonnes and 16m, while females grow to 15 tonnes and 11m.

They feed on animals like squids and giant squids, along with sharks and rays that they find deep in the ocean.

It is unknown how many there are, but it is thought that the population numbers in the hundreds of thousands. The current biggest threat, is as a result of tangle in fishing lines and nets. In some parts of the world, fishermen claim that they have kills stolen by the sperm whales deep in the ocea.

Bowhead whale

Bowhead whale

Also known as Greenland right whale, Arctic whale, steeple-top, and polar whale, they are closely related to the right whales, the bowhead whale looks quite different. It is in a different genus to the other right whales (so is a more distant relation.

The only whale that is endemic to the Arctic and sub-arctic, its mouth is a third of the size of the body. They are incredible long lived often living to 200 years old. They have incredibly thick skulls, which allows them to use their heads to break through the arctic ice.

Unfortunately, they were an early target of whalers, and so in 1966 hunting of them was banned. They have recovered to the point where out of the 5 subpopulations, 3 are endangered, one is vulnerable and the last one currently classed as low risk. Another unfortunate effect of whaling, was to put an end to the summer habits of the bowhead whale – before whaling, it appears that different whale populations would cross seas during the summer, and interbreed.

  1. The Western Arctic stock in the Bering, Chukchi, and Beaufort Seas estimated at 12,500 (though with 95% confidence range 8000-19500         
  2. The Hudson Bay and Foxe Basin stock estimated at 345 with a high confidence
  3. the Baffin Bay and Davis Strait stock which is estimated at over 1000 individuals
  4. the Sea of Okhotsk stock contains only 100-200
  5.  The Svalbard-Barents Sea stock was hunted to near extinction. As such while I cannot find a number, it is unlikely to have a large population
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Southern right whale

Southern right whale

The Southern right whale, like the other species in its genus, was hunted incredibly close to extinction. As a wide ranging species, when the population fell possibly as low as 300 in 1920 – so this species was saved by its low numbers, not the ban on hunting in 1935, which likely would have come too late.

It should be noted that Russia ignored this role until 1970. During these 35 years, many were killed by Russia, and when I say many, we are talking hundreds of thousands of species that everyone else was trying to save.

The population is now thought to be around 13,600, which is an impressive increase in around 100 years, of around 45 times increase. The historical population is estimated to lie between 55,000 and 70,000.

So where can they be watched? Far and away, the best known place to see them is Hermanus in South Africa, where around 100 whales congregate each year. I have seen them here, and it is a relatively easy species to see if you are in the right place. They are found from around around 20 degrees South to 65 degrees South around the world. In the past New Zealand was a fantastic place to watch them, and in recent years they returned for the first time in 80 years. They are also naturally seen in big numbers around Australia, and places like Patagonia.

Links will appear below as we make them

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North Atlantic right whale

North Altantic Right Whale

Once thought to exist in numbers between 9000 and 21000, but whaling pushed them close to extinction – with estimates of just a couple of hundred. In the intervening years, since 1986, the population has reached 350 – potentially doubling the population in just 37 years. However, we need to remember that only around 70 of these are breeding age females. A healthy population can expect breeding females to produce a calf every 3 years or so. Unfortunately, given the entanglements and other things that are stressing these whales, the gap between young is currently in the range 6-10 years. This means we can expect 7-11 calves a year – which suggests that for the population to double again in 37 year – we need a survival rate of over 90%

Should the population continue to grow on at that speed, it will take around 180 years for this population to recover.

Places to try to see them include

  • Jacksonville, Florida
  •  Hilton-head Island
Generally, anywhere along this section of the American coast they are a possibility.  Directly below this is a video of this whale species, and below this is a list of any mentions that this whale has had on this website (if any). As we get links, they will appear below these two sections.
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Whales, Dolphins and Porpoises family tree

Cetaceans -Whales, porpoise and dolphins

Few people can avoid stopping to watch, if they spot cetaceans from a cliff. While the family is wide and varied, they are all pretty interesting. From some of the largest and most intelligent hunters such as killer whales to the largest animal on earth the blue whale.

Whale and dolphin watching tourism is worth a lot of money – this can be essential, as in many places the extra money helps a community survive. 

I hope, overtime, to make this section of the website as large a list of places to view cetaceans and people who will help you in that quest.

As might perhaps be suspected, all of the mammal species which have returned permanently to the sea, and developed breathing holes located on their back (and therefore perfectly placed for taking quick breaths) are  related.

So what is the most closely related living land mammal? Perhaps obviously, it is a species which spends much time in the water – the hippopotamus.

As with all of these pages, as we create pages for each individual species, they will be linked to the photo below.

So the baleen whales are split into three families, these are not large as there are only 16 species of baleen whales in the world. At the current time, there are roughly 1.1 million baleen whales in the worlds oceans

Below is a family tree of the group

 

Baleen Whales

Baleenideae – the rhight whales

 

The first  living split is Baleenidae, this family is not huge. The north atlantic and north pacific are closest related, these species are closely related to the Southern pacific right whales. Their name is unfortunate – it is called right whale for 3 reasons, it swims slowly, floats when dead and carries a large amount of oil. This lead to all these species being hunted close to extinction.

North Atlantic right whale
North pacific right whale
Southern right whale
Bowhead whale

The other family is called Balaenopteroidea. Here species peel off slowly. I will list them in the order that they split.

The first split is the minke whale – of which there are 2 species, the common and southern minke whale, with the grey whale being the next most similar.

Brydes whale
Antarctic (Southern) Minke Whale
Grey whale
Common minke whale
Sei whale mother and calf Christin Khan NOAA

The next are the humpback whale and the fin whale followed by the Blue whale.

Underwater humpback whale jd forester
fin whale by Amila Tennakoon
Blue whale, taken by Australian Antarctic program

The last group of whales are from a group called the Brydes whales complex

Brydes whale
Edens whale
Omuras whale
Rice whale
Sei whale mother and calf Christin Khan NOAA

This completes the list of baleen whales. The other branch of the Cetaceans is known as the toothed whales

Toothed Whale

.I am going to look at them in 3 groups, though the third is not particularly closely related to each other

  • Delphinoidea: This includes
    • Monodontidaes – Belugas and narwhals
    • Phocoenidae – The family of Porpoises (7 species) such as harbour porpoises and Vanquita

 

bermeister porpoises
dalls porpoise Susan E Adams
Harbour Porpoise
Indo pacific (or east Asian) finless porpoise
Spectacled porpoise
Vaquita
Narrow Ridged finless porpoise (Yangtze finless porpoise by huangdan2060)
    • Delphininidae – these are the oceanic dolphins – 37 species split into several subfamilies which we will deal with one by one.
Subfamily Delphininae – 15 species (tamanend bottle nose dolphin only recognized as separate species, will build page for it at some point when photos are readily available.

Subfamily  Globcephalinae 11 species

Australian snubfin dolphin
False killerwhale by Adam U
Long-finned pilot whale nu Gailhampshire
Rough toothed dolphin
Melon-headed Dolphin
Pygmy killer whale
Irrawaddy Dophin
Short-finned pilot whale by Martina Nolte
Risso’s dolphin

Subfamily incerta sedis (latin for “of uncertain placement” )6 species

Atlantic White-sided Dolphin
Dusky dolphin by AllenMoC
Hourglass dolphin
Pacific white sided dolphin by NMFS southwest fisheries science center
Peales dolphin by fDrummondH
White beaked dolphin

Subfamily Lissodelphininae 6 sppecies

Black dolphins by Bobbyandck
Commerson's dolphin by Tonina1
Haviside dolphin by Joachim Huber
Hector dolphin by Avenue
Northern right whale dolphin
Southern right whale dolphin

Subfamily Orcininae

Orca by Robert Pittman NOAA
  • Inioidea : This includes 3 groups
    • Iniidae (only 1 of 5 genus remains -Inea (4 species: Araguaian river dolphin, Bolivian river dolphin  and Orinoco dolphin)
Amazon river dolphin by Oceancetaceen sometimes known as the Orinoco
Araguaian river dolphin by Rio Cicica
Bolivian river dolphin by Ramon and Suzanne Vargas
    • Lipotidae: which contains only one species: the Baiji or Chinese river dolphin
  • Pontoporiidae: which contains one species 
La plata dolpin

The next family is the beaked whales. There are 24 species, of which only 3-4 have been well studied. This is because they spend much of their time deep in the sea, it appears that each species does not have many members and they are incredibly reclusive in their habits.

One might ask how an air breathing animal can spend so much of its time deep in the ocean? Well the Curved beaked whale has had a dive timed at 138 minutes. More incredible, they only need around 2 minutes to catch their breathe before sinking back into the depths. This means that if required, they can spend just 20 minutes out of 24 hours at the surface – an incredible stunt.

There appear to be a great number of species that are extinct – these we will not list, but will mention each subfamily in passing.

Incertae sedis contains 5 extinct genus, Basal forms include 13 extinct genus

Subfamily Berardiinae contains 3 genus, 2 of which are extinct, but the third contains 3 living species (and one dead) .  

Genus Beradius

 

Arnoux's beaked whale
Baird beaked whale
Sato beaked whale

Next we cover the Bottlenose whales

Northern                                                                                                                     Southern and                                                        Tropical

northern bottlenose whale
Southern bottlenose whale
Tropical bottlenose whale

Subfamily Ziphiinae  contains 5 genus, 3 are extinct, but two have just one species in each

Genus Tasmacetus: Shepherds beaked whale Genus Ziphius: Cuviers beaked whale

Click on the image to see it in full

The most populous genus Mesoplodon – mesoplodont whales

As you can see, many of the pictures are of dead whales, or skulls or diagrams, or even just text. This is because sightings of many species are so rare that they have never had a photo taken

As you can see from the whale family tree, the sperm whales are separate from the rest. However, they are toothed whales so belong in this section of the page.

pygmy sperm whale
Sperm-whale-by-Gabriel-Barathieu
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