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Answer Key - Basic Animal Groups

A Summary of Correct Answers to the Basic Animal Groups Quiz

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The list below provides the answers to the Basic Animal Groups quiz, a quiz that presents a series of pictures showing animals that belong to one of six basic groups—amphibians, birds, fishes, invertebrates, mammals, or reptiles. Review the correct answers below and find out why each animal belongs to one of the six basic animal groups.

Answer to Question 1: The animal in this picture is a mammal.

Photo © Aun-Juli Riddle / Shutterstock.
The key to placing this animal in the correct animal group is the fact that it has fur. Fur is a characteristic unique to mammals. Additionally, you might elimanate the other answers based on a few facts. The animal does not have feathers so it is not a bird. It is a tetrapod and therefore not an invertebrate. It has fur so it could not be an amphibian. You may also notice this animal as a rabbit. Rabbits belong to a subgroup of mammals known as the Order Lagamorpha, a group that also include hares and pikas.

Answer to Question 2: The animal in this picture is a reptile.

Photo © LS Luecke / Shutterstock.
To conclude this animal is a reptile, it would help for you to recognize it as an alligator. Alligators, together with their cousins the crocodiles, belong to a group of reptiles known as the Order Crocodilia. If you did not recongize this animal, you could eliminate the other possible answers one by one by observing a few facts. The animal has no fur so it is not a mammal. It lives outside of water so it is not a fish. Finally, it does not have feathers so it is not a bird. It does have scales, a characteristic consistent with it being a reptile.

Answer to Question 3: The animal in this picture is a reptile.

Phot © Ecoprint / Shutterstock.
This animal is also a reptile for reasons similar to those in the answer above. The animal has no fur so it is not a mammal. It lives outside of water so it is not a fish. Finally, it does not have feathers so it is not a bird. It has four legs and a tail so it is a tetrapod and it also has scales. These characteristics point to it being a reptile. It is in fact a giant ground gecko, which is a type of lizard and lizards belong to a group of reptiles known as the Order Squamata.

Answer to Question 4: The animal in this picture is a bird.

Photo © Yaniv Eliash / Shutterstock.
The key to identifying the animal group to which this animal belongs is the fact that it has feathers. Of all the animal groups, only birds have feathers. Like mammals, reptiles, and amphibians, birds too are tetrapods. They possess a backbone so they are vertebrates. The bird in this picture is a spur-winged plover (Vanellus spinosus), also known as a supr-winged lapwing. It belongs to the Order Charadriiformes, a diverse group of birds that includes shorebirds, waders, gulls, and auks.

Answer to Question 5: The animal in this picture is an invertebrate.

Photo © Mariko Yuki / Shutterstock.
You can deduce that this animal is an invertebrate several ways. First, the other three available answers (reptile, bird, and amphibian) all are tetrapods. The animal in this picture, which happens to be a sally lightfoot crab (Grapsus grapsus) has five pairs of legs. The sally lightfoot crab is a type of arthropod (Phylum Arthropoda) and all arthropods are invertebrates. The sally ligthfoot crab lives along the Mexican and Central American coastline and is also a resident species of the Galapagos Islands.

Answer to Question 6: The animal in this picture is an invertebrate.

Photo © Sergey Chushkin / Shutterstock.
As in the preceeding answer, there are several ways you can conclude this animal is an invertebrate. It has three pairs of legs and for this reason is not a bird, amphibian, or mammal—which are all tetrapods. The butterfly in this picture is a lesser-marbled fritillary butterfly (Brenthis ino). This species inhabits central Europe. Butterflies belong to a group of insects (Class Insecta) know as the Lepidotera (moths and butterflies). All insects are arthropods and as such are invertebrates.

Answer to Question 7: The animal in this picture is a reptile.

The animal pictured here is a reptile for a combination of reasons. The animal has no fur so it is not a mammal. It has scales but lives outside of water so it is not a fish. Finally, it does not have feathers so it is not a bird. It has four legs and a tail so it is a tetrapod and it also has scales. These characteristics together indicate it is a reptile. You may recognize it as a type of chameleon, a subgroup of reptiles belonging to the Order Squamata (lizards and relatives).

Answer to Question 8: The animal in this picture is an amphibian.

The animal pictured here is a frog, a type of amphibian. It can easily be concluded that it is neither a mammal or a bird since it does not possess fur (a trait indicative of mammals) or feathers (a trait unique to birds). Additionally, this animal has four legs so it is a tetrapod and all tetrapods are vertebrates (so it is therefore not an invertebrate). The animal in this picture does not possess scales so it is not a reptile or a fish.

Answer to Question 9: The animal in this picture is a fish.

This animal lives in water and has scales and fins. It is a fish. It does not have fur, a characteristic of mammals, nor does it have feathers, a characteristic of birds. It does not have four limbs so we can conclude it is neither an amphibian nor a reptile. Since it has a backbone, it is not an invertebrate.

Answer to Question 10: The animal in this picture is a mammal.

Photo © Kristian Sekulic / Shutterstock.
Don't be fooled into thinking this animal is a fish just because it lives in water. Dolphins are mammals and they belong to the subgroup of mammals known as the cetaceans (Order Cetacea). Other members of the Order Cetacea include whales and porpoises. Dolphins breath using a blowhole at the top of their head. They have lungs, not gills as fish do. Dolphins are warm-blooded and their skin is smooth, not covered in scales like the skin of a fish.
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