Mammals include the largest animals on the planet, the rorquals and other large whales, as well as some of the most intelligent, such as elephants, primates, including humans, and cetaceans. The basic body type is a four-legged land-borne animal, but some mammals are adapted for life at sea, in the air, in trees, or on two legs. The largest group of mammals, the placentals, have a placenta, which enables feeding the fetus during gestation. Mammals range in size from the 30–40 mm (1.2–1.6 in) bumblebee bat to the 33-meter (108 ft) blue whale. 

The word "mammal" is modern, from the scientific name Mammalia coined by Carl Linnaeus in 1758, derived from the Latin mamma ("teat, pap"). All female mammals nurse their young with milk, which is secreted from special glands, the mammary glands. According to Mammal Species of the World, 5,416 species were known in 2006. These were grouped in 1,229 genera, 153 families and 29 orders. In 2008 the IUCN completed a five-year, 1,700-scientist Global Mammal Assessment for its IUCN Red List, which counted 5,488 accepted species.

1. What are rorquals?
2. What are some of the largest animals on the planet?
3. Are mammels adapted for the land only?
4. What else are they adapted to?
5. What is the basic body type?
6. What is the word derived from?
7. and in Latin?
8. meaning?
9. Do all mammels produce milk and nurse?
10. Where is it secreted from?
11. How many mammel species were known in 2006?
12. according to who?
13. how were they grouped?
14. What happened in 2008?
15. How many did they count?
16. Were these accepted?
17. What is the largest group of mammels?
18. Why are they called this?
19. What does this do?
20. Whatis the smallest mammal?

Numbered answers:
1. large whales
2. Mammals
3. No
4. in the air, in trees, or on two legs.
5. four-legged land-borne animal
6. from the scientific name Mammalia
7. mamma
8. teat, pap
9. All female mammals
10. the mammary glands.
11. 5,416
12. Mammal Species of the World
13. 1,229 genera, 153 families and 29 orders.
14. The IUCN completed a five-year, 1,700-scientist Global Mammal Assessment for its IUCN Red List,
15. 5,488 species.
16. Yes
17. placentals
18. They have a placenta
19. enables feeding the fetus during gestation
20. bumblebee bat