This Friday I have a challenge for you. Can you work out which five different species these mandibles come from?
They are all different sizes and the lack of scale bars is deliberate – this is about trying to find useful features from the shape rather than the size, It’s not easy!
You can put your answers in the comments section below. Good luck!
Last Friday I gave you this nice robust skull to identify:
There was a healthy discussion about possible identifications, with the importance of scale mentioned more than once (by Jake, palaeosam, Lena and Robin Birrrdegg). Not only is this a robust skull, it’s also quite large, ruling out the British carnivores – and it clearly is a carnivore judging by the canines and the well-defined sagittal crest.
The lack of cutting and puncturing premolars and molars means that cats, dogs, hyaenas and other very carnivorous large carnivores can be ruled out, narrowing down the likely options in the right size range to the bears, as recognised by palaeosam, Ric Morris, Robin Birrrdegg, Will Viscardi, cromercrox, cackhandedkate, Lena, Daniel Calleri, henstridgesj and Carlos.
The species is a bit more difficult to work out, but the big sagittal crest and fused sutures suggests that this is not an juvenile bear, meaning it’s too small for a bear of the Brown or Polar variety. That still leaves quite a range of other possible bears, but the pronounced forehead and long square muzzle rules out the Giant Panda, Sun Bear, Spectacled Bear and Asiatic Black Bear, while the big robust incisors rule out the Sloth Bear. That leaves the American Black Bear Ursus americanus Pallas, 1780.
Ursus americanus by Mike Bender/U.S. Fish and Wildlife Service, 2008
So well done to cromercrox, Carlos and Robin Birdeggg who all got the species correct!
This week I have a nice skull for you to identify. Any idea what this is?
As usual you can leave your suggestions, questions and observations in the comments section below.
Have fun!
Last Friday I gave you this distinctive skull to identify:
I knew it would be a bit of an easy one, given the highly unusual teeth, but it seemed too interesting a specimen to not use.
As cryptically suggested by many of you (Jamie Revell, Nigel Monaghan, henstridgesj, rachel, cromercrox, Robin Birrrdegg, Allen Hazen and Crispin), this is indeed the skull of a Crabeater Seal Lobodon carcinophaga (Hombron & Jacquinot, 1842).
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These seals are specialised for catching krill, hence the strange shape and tightly fitting nature of their teeth, which act as a filter to strain the tiny crustaceans from ocean water.
Because these seals live in the waters all around the Antarctic, monitoring their population is particularly difficult, so estimates of their numbers vary considerably, from 2 million to 12 million (which is the more likely figure).
As with most abundant animals they have predators, in particular Leopard Seals. Apparently 78% of adult Crabeaters bear scars of Leopard Seal attacks, which can be seen clearly on the live individual in the image above. Most of the attacks happen before the Crabeaters reach a year old and get a bit too big to be easy prey, but in that first year there is apparently a huge mortality rate, with only 20% of seals making it to their first birthday. Good old Mother Nature is never one for sentiment.
This week I have a very distinctive skull for you to identify:
Because I expect some of you to work out what it is straight away, can you make your answer cryptic please, to give other people an opportunity to work it out.
I look forward seeing some cunning and clever hints at what this is!
Last Friday I gave you this skull to identify:
It was obvious to everyone who had a go at answering that it was the skull of a marine turtle of some sort, but that’s where it got a bit more tricky. There are only seven species of marine turtle, but their skulls all look quite similar to the untrained eye – mine included.
However, when I found this specimen I decided to improve my skills and I searched for a decent identification guide for turtle skulls, which I was fortunate to find hosted by Florida Atlantic University.
Checking through the characters I discovered that the palate of turtles can be very helpful in identifications, so here’s a colour coded and labelled diagram prepared from the image above that should help illustrate a key diagnostic feature:
As some of you may have noticed, the maxilla (tinted red) on either side of the palate meet in the middle, which is a characteristic only seen the Loggerhead Caretta caretta Rafinesque, 1814. The other turtles have the maxilla separated by the vomer (tinted green). Well done to mark b, cromercrox and donald who managed to get the right turtle species!
Loggerhead Turtle. Photo by ukanda, 2006
These large marine turtles will eat pretty much anything they can find, from jellyfish to crabs and sponges. Unfortunately that includes things like plastic, which causes all sort of problems for their digestive system. Just one problem that they face, on top of getting tangled up in fishing tackle and poor survival of their young due to predation from pretty much everything (from foxes to crabs and gulls to sharks). Sadly, it’s not much fun being a turtle.
This week I have an object that was in need of identification that I found in the collections. Any idea what this is?
As usual you can put your comments, thoughts and suggestions below. Enjoy!
Last Friday I was at the SPHNHC, NatSCA and GCG joint conference in Cardiff, which provided a fantastic opportunity to catch up with natural science curators, conservators and collections managers from all over the world, but which gave me limited time to spend on the mystery object.
As a result you ended up with an object that made an appearance in a ‘feely box’ at a fun pub quiz organised by guys at the Oxford Museum of Natural History.
Feely boxes in action
Lurking within…
It’s not the prettiest object but it’s characteristic shape and structure makes it readily identifiable using touch.
Jake spotted that it was a horizontal section through a skull, including the palate and Maxine and Julie Howard recognised the tusk alveoli extending from the maxilla, and correctly suggested Pumbaa, or Warthog Phacochoerus africanus (Gmelin, 1788).
Touch is an often under-appreciated sense in science, but it can be used to identify some specimens and provide a new perspective on the evolution of forms in nature. This is something I came to realise when working at the National Museum of Ireland – Natural History in Dublin, where I was fortunate enough to meet evolutionary biologist Dr Geerat Vermeij, who has been blind since birth, yet is able to identify shells to species and read part of their life history from touch alone.
Geerat Vermeij, Evolutionary Biologist, Reading A Shell’s Story from Shape of Life on Vimeo.
I usually offer up a mystery object on Friday, but here’ a bonus object that landed on my desk this morning.
Apparently it was found in a horsefield in Kent, I have narrowed down the likely species of the animal that ‘donated’ the bone to a couple of options, but thought you might like to have a go as well, before the specimen is handed over to our Anthropologists to inspect the engraved designs.
As usual can can leave your comments below. Have fun!
Last Friday I gave you these bits of mystery forelimb (scapula and humerus) to identify:
I thought it would be an easy one, since it’s from a very common species with a near global distribution – plus the humerus has quite a characteristic crest along the proximal end, from the shoulder articulation to the middle of the bone.
Most people who commented noticed this crest and Jake suggested that it had adaptive features (along with the scapula), maybe for a specialised way of life.
As it turns out, these bones come from an animal that is probably best described as a specialist generalist – a Brown Rat Rattus norvegicus (Berkenhout, 1769).
These versatile and intelligent animals are very good climbers and brilliant swimmers, using their forelimbs to both get around and manipulate food.
This particular rat was a male pet rat purchased from Harrods in October 1960 – I get the impression it didn’t survive for that long, since the humerus head hasn’t fully fused. You can’t buy pets from Harrods any more, so this specimen not only shows us what a rat’s humerus and scapula look like, but it also represents a teeny-tiny piece of British history.
This week’s mystery object is a bit of a break from the cat skulls. Any idea what these two bones are and what species they’re from?
As always, you can put your thoughts and suggestions in the comments section below, but if you think it’s easy please try to be a bit cryptic in your response, to give other people a chance. Enjoy!
On Friday I asked you to spot the differences between these two cat skulls and I wondered whether anyone could identify them:
Both henstridgesj and Allen Hazen made some good observations, the first being about the difference in size, then about morphological features that I’ve marked on this image:
Now henstridgesj also correctly identified one of the skulls – the one on the right of the image is from a Domestic Cat Felis catus Linnaeus, 1758.
As it turns out, this was a bit of a trick mystery object, since BOTH of the skulls belong to Domestic Cats, so this gives us a useful idea of the kind of variation we might expect within a species.
I think that the main cause of variation between these two animals is probably sex, with the male on the left and the female on the right. There may also be differences based on age (although I don’t think that’s a major factor), breed and perhaps disease (the larger specimen looks like it had an infection that affected the surface of the bone).
After taking various measurements, the most useful difference I’ve found between the two skulls is shown with the yellow line. I think that the ratio of these two measurements may provide a way to tell the difference between a male and female cat (in the male it’s around 1 or less than 1, in the female it’s greater than 1) but I’ll need to make a LOT more measurements to test this.
Two other ideas that could be tested were suggested by henstridgesj and Allen Hazen. Allen said: “My impression is that the presence and development of sagital crests, among felidae, correlates pretty strictly with size” and henstridges said: “It seems that if the species of cats are arranged in increasing size order, then the anterior half of the skull (forward of the frontal-parietal suture) seems to increase in size more than the posterior half”.
I’d better take a look to see if this has been tested before…
Last week I gave you this rough and ready mystery object to identify:
I thought it might be a bit of a challenge as it had originally been misidentified as a piece of elephant tusk by someone in the museum, many years ago, so it was obviously not a straight-forward identification.
One of the key identifying characteristics of ivory are the Schreger lines, as pointed out by Carlos and rachel. These lines are an optical effect caused by light interacting with the dentinal tubules that provide the structure of the tusk:
Tusk section showing Schreger lines
However, these lines aren’t always visible and it will depend on the angle of the cut of the tusk and the angle and intensity of the light.
Another factor to keep in mind is the nature of the material. If you look at a cut section of elephant tusk you note that you get clean edges, because the tusk is quite hard and keeps its structure when cut. It can also show faint growth rings, radiating from the pulp cavity (nearer the tip the cavity is filled in):
Section of elephant tusk showing clean edges
Instead, the mystery object has a very rounded edge and no clear structure. This suggests to me that it’s horn that has been treated with heat to mould it into shape (keratin that makes horn and hair has thermoplastic properties, which is why hair straighteners work).
So what this mystery object appears to be is a piece of bovine horn – probably cow – that has been melted and shaped at one end to form a cup. The superficial similarity to elephant tusk may or may not have been accidental, after all, elephant ivory is a much sought after material.
A rushed mystery object today I’m afraid, as I was doing talks at a late event last night and I have a painfully early start this morning – plus I’ve not been in the stores this week, so no opportunity to get a good mystery object to photograph!
So here’s an object that I was asked to identify a while back, that I took some snaps of on my phone. Apologies for the poor image quality:
Any idea what this might be? As usual you can put your observations, questions and suggestions in the comments section below.
Last Friday I gave you this felid skull to identify:
As with the other cats over the last few weeks, it’s been difficult to find really clear diagnostic features.
The size helps narrow down the possibilities and the lack of divided auditory bullae rules out some of the species of Lynx, as does the presence of the small first premolar.
However, beyond that there isn’t much to really differentiate this cat from other species, apart from general features of relative proportion (height vs width vs length) and perhaps the angle of the rear part of the sagittal crest (which will probably vary between individuals).
Nonetheless, henstridgesj managed to correctly identify this as an Ocelot Leopardus pardalis (Linnaeus, 1758), one of the largest of the small cats in South America.
My challenge is going to be find a way to pull together the variety of cat skulls we’ve had for the last few weeks, to help make cat skulls a little easier to identify in the future – if that’s even possible. No pressure…
We’re heading towards the end of the cats this week – any idea what this slightly battered looking feline might be?
Suggestions gratefully received in the comments section below!
Last Friday I gave you this felid skull to have a go at identifying:
The size was larger than the previous cat skulls I’ve shown you, which helped reduce the possibilities a bit – after all, there are more smaller cats than bigger ones.
As it turns out, Sam Misan and henstridgesj both managed to work out that this is the skull of a Serval Leptailurus serval (Schreber, 1776).
A Serval cat at Serengeti National Park, Tanzania, by Bob, 2007
These long-legged cats have a relatively small head, but huge ears – and the large external auditory meatus (ear hole) with a very pronounced ridge above for attachment of the muscles of the pinna (the fleshy part of the ear) helps reflect that.
The long legs and the big ears are key to the Serval’s hunting technique in the long grasses of the African savannah, where they listen for the movement of rodents which they dramatically leap on. Probably easier to appreciate this method by seeing it:
For the last few weeks I’ve been using cat skulls as mystery objects, because they are really hard to tell apart and I was hoping that some useful distinguishing features might get spotted when you try to identify them.
I certainly feel like I’ve learned something, but I’m pleased to say that there aren’t too many more skulls to go, because it’s really difficult. This next one should hopefully be a bit easier than some of the recent cats:
Any idea what fine felid this skull comes from?
As usual I would really appreciate your thoughts in the comments section below – let’s see if we can crack this!
Last Friday I gave you this fine feline to have a go at identifying:
I was a little suspicious of the identification attached to the specimen, but Al Klein suggested the same species – the Jaguarundi Puma yagouaroundi (É. Geoffroy Saint-Hilaire, 1803) [link opens pdf].
My reasons for suspicion were the nature of the post-orbital constriction (the narrowing of the braincase behind the eyes), the nature of the zygomaticotemporal suture between the temporal process of the zygomatic and the zygomatic process of the temporal bone (the bit where two bones meet to make the arch of the cheek) and the shape of the nasal bones where they meet the frontals (the V shaped bones above the nose area).
The observation by henstridgesj that the skull was similar to the previous mystery object (Leopardus tigrinus) was a good one, so I decided to research the genus Leopardus in a bit more detail, to see if there was a better match.
It turns out that the skull I found that matched this one most closely – especially with regard to the relative lack of a post-orbital constriction and the nasal-frontal junction – was the highly arboreal Margay Leopardus wiedii (Schinz, 1821) [link opens pdf].
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I’m always a bit reticent to re-identify specimens that have original labels from the supplier attached as this one does, but this comes from suppliers (Dr.s Schlüter & Mass) that I know have seriously misidentified or mislabelled specimens in the past (e.g. labelling a African Lappet-faced Vulture as an Andean Condor from Bolivia).
Of course, the real identification may be even more complicated, since the South American cats have a bit of a track record for hybridising to the point of masking distinct species, so any identification I make will be laden with disclaimers and caveats. The joy of real-world animals when contrasted against nice simple biological concepts…
I hope you’re not all fed up with cats yet, because here’s another:
I have concerns about the identification attached to this one, so let’s see if your thoughts agree with what I have written on the label.
As always, you can put your thoughts below and they will be very welcome!
Zygoma 