I've Got Two Legs Trivia Quiz

Answer: Anatidae

The family Anatidae includes ducks as well as swans and geese. The smallest of this family is the cotton pygmy goose, at 26.5cm and 164grams, to the trumpeter swan, at 183cm and 17.2kg.
Anseriformes is the order that the duck falls under, Oxyurinae is a subfamily of ducks, and Aves is the class encompassing birds.

Answer: Hylobatidae

Gibbons are more closely related to monkeys than 'great apes' such as gorillas, chimpanzees and humans yet walk bipedally whereas some of the greater apes 'knuckle walk' rather than walk entirely on two legs. The Hylobtidae family is divided into four genera depending on their diploid chromosome number (which of their chromosomes are copies of one another).
Hominoidea is the superfamily of the gibbon which includes all apes, including humans; Hominidae is the family including 'great apes'; Primate is the order in which the gibbons (and all apes) belong.

Answer: Macropodidae

The Macropodidae (macropod means 'large foot') family includes marsupials such as kangaroos, padmelons and wallabies. These herbivorous animals are native to islands around (and including) New Guinea and Australia, although carnivorous kangaroos are known to exist in the past.
Wallabia is a genera of Macropodidae (swamp wallaby); Macropus is the genus including kangaroos, some wallabies, and wallaroos; and Petrogale is the genus that includes the rock-wallabies.

Answer: Manidae

Pangolins were once considered a close relation to anteaters - but not anymore - although it can be confusing because they are sometimes referred to as a 'spiny anteater'. Yet they do eat ants. Hmmm... The powerful back legs of the pangolin allow them to sometimes walk upright as a biped. Pangolins are also the only mammals with scales.
Manis is the genus that pangolins belong to, Pholidota (as well as being a genus of the family Orchidaceae - orchid) is the order to which pangolins belong, and Manis gigantea is the pangolin species 'giant pangolin'.

Answer: Tyrannosauridae

Tyrannosauroidea is the superfamily, Tyrannosauridae is the family, Tyrannosaurinae is the subfamily and Tyrannosaurus is the genus for the tyrannosaurus rex.
There were several biped dinosaurs but the Tyrannosaurus rex was one of the largest and possibly one of the most well-known and recognized dinosaurs.

Answer: Muridae

Muridae contains over 600 species of true mice, gerbils and rats making it the largest mammal family. Muridae is of the superfamily Muroidea and contains the subfamily Murinae. All of this fits under the order Rodentia.
Non-locomotive bipeds are those that can sit or squat on their hindlegs yet revert to four legs to move around.

Answer: Ursidae

All bears, including the panda, polar and grizzly, belong to the Ursidae family. Of the eight living species only one is mainly herbivorous - the panda. It has teeth and digestive tract similar to that of carnivorous bears and will eat eggs, fish and meat if they are available.

The polar bear is mainly carnivorous and the other six species have highly-varied, omnivorous diets. Ursus refers to the genera of bears including brown, polar and black bears. Ailuropoda contains five species of giant pandas, and Ursavus includes an extinct genus of bears living from approximately 23-5.3 million years ago.

Answer: Corytophanidae

The family 'Corytophanidae' includes lizards such as basilisks and some iguanas. Basiliscus is the genus to which basilisks belong, Sauropsida is the class containing the Corytophanidae family, and Iguania is the suborder containing iguanas, agamids, chameleons and 'new world lizards'.
Flaps between the toes on the basilisk help to support it when it is moving over water. After a short time 'walking' on water, the basilisk will sink into the water then swim using all four limbs.

Answer: Blaberidae

When at high speed, many cockroaches actually move bipedally (whether a giant cockroach or not).

The death's head cockroach (Blaberus craniifer) is definitely a creepy looking insect. The hybrid death's head cockroach (Blaberus craniifer x Blaberus fusca) is similar looking to the death's head cockroach but is more common because it breeds faster and grows larger than the death's head cockroach. At three inches long and almost see-through, this cockroach is commonly used for feeding reptiles and large spiders. To make things even more confusing, there is the false death's head cockroach, or discoid cockroach (Blaberus discoidalis), which looks similar again to the hybrid and death's head cockroaches and is also used for feeding pet lizards and spiders (such as tarantulas). All three have wings but none can fly or climb glass so are easily kept in an aquarium and as pets.

Blaberidae is the family to which giant cockroaches belong (and it is the second largest cockroach family), Blattellidae includes smaller common house cockroaches referred to as 'wood cockroaches', Polyphagidae contains those cockroaches known as 'sand cockroaches', and Insecta is the class to which all cockroaches belong.

*many thanks to editor chrisw for help with this question

Answer: Octopodidae

The coconut octopus 'walks' on two limbs, wraps the other limbs around itself and looks like a coconut walking over the sea floor - a very interesting thing to see (several videos are easily found with a quick search). Other octopi that have the ability to 'walk' bipedally use their other limbs to make a seaweed-like cover as they move over the seafloor. The order Octopoda refers to octopi in general, Octopodidae is the family of most known octopi, Mollusca refers to the phylum of the octopus (and cephalopods in general). Cephalopoda is the class referring to creatures also known as 'inkfish' - the ability of these creatures to squirt ink.