Wied's Marmoset

Callithrix kuhlii

Wied's Marmoset is a small New World Monkey that lives in a small little pocket of forest near the Brazilian Atlantic Coast.

The social structure of the Wied's Marmoset is rather interesting. They live in a polyandrous society led by a dominant female. This female is often the only one who mates, and she will typically mate with multiple males.

Another, even more interesting fact about these Monkeys is that they commonly exhibit Chimerism. Wied's Marmosets typically give birth to twins, and while in utero the cell lines of the twins can be exchanged, leaving the offspring with their own genotype, and also the genotype of their sibling. Because the society is polyandrous, two zygotes could be fertilized by two different males... which means a Wied's Marmoset can have genetic information from two different fathers. Also astounding is the fact that a male could pass on his secondary cell line, rather than his primary. This would result in offspring that are more closely related to their uncle than to their own father!

The result of the Chimerism is a society that is invested in raising the offspring as a group, as one can never know for sure whose genetic information can be found in with offspring!

The species is currently listed as Near Threatened, and the wild population is on the decline. This is due to habitat loss (for farming purposes) and hunting for the pet trade. Many of the Marmosets now live within the confines of wildlife refuges and national reserves, and they are listed in CITES II.

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IUCN Status : Near Threatened
Location : Brazil
Size : Body Length up to 28in (70cm)

Classification : Phylum : Chordata -- Class : Mammalia -- Order : Primates
Family : Callitrichidae -- Genus : Callithrix -- Species : C. kuhlii

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Olive Ridley Sea Turtle

The Olive Ridley Sea Turtle is one of the smaller Sea Turtles; they have a carapace length of around 2ft. They also have the distinction of being the most abundant Sea Turtle on the planet, with about 800,000 females coming ashore to nest annually.

Lepidochelys olivacea

Olive Ridleys, named for their olive coloration, have a very large distribution and can be found in tropical waters around the world. They are a migratory pelagic Turtle, but they also can be spotted in coastal regions as well.

Olive Ridley Sea Turtles exhibit one of the most interesting nesting habits in the world. Once or twice a year, in waves triggered by some unknown event (Lunar Cycles? Wind? No one knows for sure), thousands of female Turtles come ashore in events called Arribadas. Each turtle lays around 100 eggs, and sometimes there are so many Turtles that they actually dig up previously laid nests in order to deposit their offpspring! One beach in India saw 200,000 females at a single event!

Despite the large population number, Olive Ridley Sea Turtles are considered to be Vulnerable by the IUCN. This is because the selected survey sites have shown a population decline over the last 2-3 generations. The Marine Turtle Specialist Group actually reports a 50% decline since the 1960s. The Olive Ridleys are at risk due to hunting, egg harvesting, bycatch, and habitat degradation. So while they are the most abundant of the Sea Turtles, they are also one of the most exploited. The Turtles are currently protected by numerous agreements and treaties, including CITES I.

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IUCN Status : Vulnerable
Location : Tropical waters worldwide
Size : Carapace Length up to 28in (70cm)

Classification : Phylum : Chordata -- Class : Reptilia -- Order : Testudines
Family : Cheloniidae -- Genus : Lepidochelys -- Species : L. olivacea

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Pale-mandibled Aracari

Pale-mandibled Aracari at the Milwaukee County Zoo

Meet the Pale-mandibled Aracari, a species of bird that belong to the Ramphastidae family, making them relatives of the Toucans (can't you tell?) They can be found in the forests of Ecuador and Peru.

Pale-mandibled Aracaris are named for... well... their pale-colored beaks. Their bodies are primarily black, but they sport some really beautiful splashes of color, including bright yellows, oranges, and reds on their chest and underbelly, and a huge pop of red on the back.

These birds are prolific frugivores, meaning that they eat lots and lots of different fruits. In the wild they actually feed off of over 100 different types of plant! They also will eat insects to get some extra protein.

They lay small clutches of of 2-4 eggs that take only 2 weeks to hatch. The young birds fledge after about 40 days.

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IUCN Status : Least Concern
Location : South America
Size : Body Length up to 2ft (60cm), Weight up to 20lbs (9kg)

Classification : Phylum : Chordata -- Class : Aves -- Order : Piciformes
Family : Ramphastidae -- Genus : Pteroglossus -- Species : P. erythropygius

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Nutria

Myocastor coypus

What is this weird, beaver/rat looking Rodent? Why, it is the Nutria! Sometimes also referred to as the Coypu.
These guys are native to South America, where they live near bodies of water and feed on the aquatic plants.

Nutria often live in colonies where they breed at very quick rates. A female may have 2 or 3 litters a year, with each litter producing as many as 13 offspring! The young Nutria leave their mother after only a month or two. They are a short lived and very quick growing species. Male Nutria can reach sexual maturity at four months of age, and they tend to live for only a few years.

Outside of their natives lands, Nutria are very, very destructive. See that shaggy, not especially appealing coat? Well under that is a very dense undercoat that has long been used in the fur industry. The desire for these pelts resulted in the growth of captive breeding fur farms... that the Nutria occasionally escaped from.

The species is now considered invasive in several US states, as well as in parts of Europe, Africa, and Asia. They are destructive because they breed quickly and feed on wetland plants, but care only for the stems. This means that they consume huge amounts of vegetation with much of it going to waste. The loss of vegetation leads to more erosion and soil displacement, which damages the wetlands. Nutria also carry parasites and displace native species. Hunting and chemical control methods are attempting to cut down the invasive populations, but only time will tell.

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IUCN Status : Least Concern
Location : South America
Size : Body Length up to 2ft (60cm), Weight up to 20lbs (9kg)

Classification : Phylum : Chordata -- Class : Mammalia -- Order : Rodentia
Family : Myocastoridae -- Genus : Myocastor -- Species : M. coypus

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Pyrenean Brook Salamander

Calotriton asper

As the name suggests, the Pyrenean Brook Salamander (sometimes called the Pyrenean Newt) is endemic to Europe's Pyrenean Mountains. They live in clear, oxygen-rich mountain streams and lakes, and live at a variety of altitudes ranging from around 175m to 2900m. The species can be identified by its squarish head and warty skin.

Pyrenean Brook Salamanders live most of their lives in the water, though they do have very flattened bodies and heads that allow them to hide under rocks at the waters' edge. Mating takes place after waking up from hibernation, and the eggs are laid underwater.

The length of the larval stage depends a lot on the altitude in which the Salamanders are living. The stage last around 14 months for those at lower altitudes, but can take as long as two years for those higher up on the mountain. Pyrenean Brook Salamanders can live as long as 20 years.

The species is still relatively safe overall, due to their large range. However, some local populations are becoming scarce and even extinct, due to habitat loss from damming, development, and pollution.

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IUCN Status : Near Threatened
Location : France and Spain
Size : Length up to 5.5in (14cm)

Classification : Phylum : Chordata -- Class : Amphibia -- Order : Caudata
Family : Salamandridae -- Genus : Calotriton -- Species : C. asper

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Blue-bellied Roller

Blue-bellied Rollers are very striking blue, teal, and buff birds that live in the forested areas of western and central Africa. They are social birds that live in small groups, and they feed primarily on small reptiles and invertebrates. Hunting is done by sitting high up in a tree and then dive bombing the prey.

The species is named for their courtship ritual. The male and female birds perform rolling flights while calling out to each other. The birds are believed to be mostly monogamous, though some males will mate with more than one female. 2-3 eggs are laid at a time, usually in a tree hole, and the female does most of the incubating. During this time the birds are incredibly territorial and will attack other birds that come anywhere near the nest!

Blue-bellied Rollers are not in any current danger. They have a large range, are abundant within it, and show no major signs of population decline.

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IUCN Status : Least Concern
Location : Western and Central Africa
Size : Length up to 1ft (30cm)

Classification : Phylum : Chordata -- Class : Aves -- Order : Coraciiformes
Family : Coraciidae -- Genus : Coracias -- Species : C. cyanogaster

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Hipparion

Hipparion

Hipparion is the name given to an entire genus of now-extinct, yet successful horses that roamed throughout most of the world. They first evolved around 22 million years ago in North America, and from there they spread to Africa, Asia, and Europe over the next 20 million years.

If you looked at Hipparion, you might think it was a small modern horse or pony. They were about the same height and weight... but the legs were a bit... off.

You see, horses didn't always have a single hoof. They are odd-toed ungulates (Perissodactyls) which means that their weight is distributed through a single toe on each leg, rather than between two toes (think of a cloven deer hoof). Early horses started out having several toes, and gradually they lost them all except for that single, central digital. Horse speed can be attributed to the fact that they have longer stride lengths, as they are actually running on a fingernail!

Hipparion moved a lot like a modern horse, which is something we know from looking at fossilized hoof-prints. But even though Hipparion ran on one hoof, it still had some of its other toes! These toes were placed slightly higher up on the leg, one on either side of the hoof, and they did not touch the ground. Modern horses have lost these vestigial toes all together.

The last of the Hipparion species went extinct around 2 million years ago. Though these early equines belonged to the same subfamily as the modern Horses, they are not their descendants.

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Status : Extinct for around 2 million years
Location : North America, Europa, Asia, Africa
Size : Height up to 13.3hands (1.4m)

Classification : Phylum : Chordata -- Class : Mammalia -- Order : Perissodactyla
Family : Equidae -- Genus : †Hipparion

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