what is the smallest land mammal?
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Kitti's hognosed bat, also known as the bumblebee bat is generally considered the smallest mammal (as asdf... said).  This record is based on skull length, with the bat having the shortest skull of any mammal.\n\nIf you take the smallest mammal as being the one with the lowest average adult body mass, then the smallest mammal is the Etruscan pygmy shrew.  It weighs less than the bat, but because it has a long nose, its skull is longer.
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Land animals can walk on land and breath oxygen. With the exseption of dolphins and whales the others cant breath oxengen.
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under the taxanomic classification, mammals are a sub calssification of animalia under the five realm kingdom.
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From wikipedia\nMost early mammals were tiny shrew-like animals that fed on insects. However, in January 2005, the journal Nature reported the discovery of two 130 million year old fossils of Repenomamus, one more than a meter in length, the other having remains of a baby dinosaur in its stomach (Nature, Jan. 15, 2005 [1]). The earliest mammals include:\n\nEozostrodon: Triassic and Jurassic \nDeltatheridium: Cretaceous \nJeholodens: mid-Cretaceous \nMegazostrodon: late Triassic and early Jurassic \nTriconodont: Triassic to Cretaceous \nZalambdalestes: late Cretaceous \nAlthough mammals existed alongside the dinosaurs, mammals only began to dominate after the mass extinction of the dinosaurs 65 mya, in the Cenozoic.
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Placentarian mammals do (not the platypus or equidna)
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The smallest fish in the world is  the Paedocypris progenetica, a member of the carp family, only grow to 7.9 millimeters (0.31 inches)\n The new fish was discovered on Sumatra island by fish experts Maurice Kottelat from Switzerland and Tan Heok Hui from the Raffles Museum of Biodiversity Research in Singapore.
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Researchers say that dolphins, along with whales and porpoises, are descendants of land-living mammals, most likely of the Artiodactyl order. Modern dolphin skeletons have two small rod shaped pelvic bones thought to be left-over hind legs. They entered the water roughly 50 million years ago.
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you mean sphere? because it has the smallest surface area in terms of volume.
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none, only small brown dogs are born
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Vatican city is the smallest (0.2 square miles)\nMonaco is the second smallest (0.7 square miles)\nNauru is the third smallest (8.5 square miles)\n\nMany other small countries at the website below.
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The second heaviest animal on land is the forest elephant.\n\nThere are 3 different species of living elephants, all as distantly related to each other as horses and donkey. These three different types of elephants make up the three heaviest land animals.\n\nFollowing them come the Northern white rhino and the African hippopotamus, which overlap in size and so can not be separated.\n\nFollowing that are the southern white and black rhinos.
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lower level animals IE protozoans, flagellates
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An amoeba is the smallest animal in the world. It is a single cell organism. This means it has ONLY one cell in its whole body and insides.
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b) has the smallest mass
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The smallest species is probably the Dwarf Lantern shark {Etmopterus perryi), with total length of about 6 inches (16 centimetres) for mature males, and 7.5 inches (19 centimetres) for mature females. \nThe second smallest is the Spined Pygmy Shark (Squaliolus laticaudus), with 6 inches for males and slightly longer females (7.8 inches or 20 centimetres). \nAnother diminutive shark (although I'm not sure if it's the third smallest) is the Cookie-cutter shark (Isistius brasiliensis). It's bioluminiscent and grows up to about 1.5 feet (50 cm). \n\nAll belong to order Squaliformes, which includes the smallest sharks along with some good-sized species.\n\n----------------\nUpdate: I've learnt of another very small shark, Euprotomicrus bispinatus (22 cm total length for males, 27 cm for females). I guess that's the third smallest.
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The smallest spider in the world is the Samoan moss spider, Patu marplesi, which has a leg span of only 0.017 inches.
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A bee hummingbird. It is the smallest in the hummingbird family.