Lizard

Scientific name: Order Squamata (suborder Lacertilia) – over 7,000 species
Size: Varies enormously – from 1.6 cm (0.6 inches) [dwarf gecko] to 3 meters (10 feet) [Komodo dragon]
Appearance: Elongated bodies, four legs (usually), long tails, scaly skin, movable eyelids (except geckos), and external ear openings
Habitat: Found on every continent except Antarctica – deserts, rainforests, mountains, grasslands, swamps, and even urban gardens
Where found: Worldwide except Antarctica. Highest diversity in Australia, South America, Southeast Asia, and Africa

Region	Examples
Americas	Iguanas, anoles, Gila monster, collared lizards
Australia	Goannas (monitors), bearded dragons, skinks, geckos
Africa	Chameleons, geckos, skinks, monitor lizards
Asia	Draco lizards (flying), tokay geckos, water monitors
Europe	Wall lizards, slow worms (legless), geckos

Diet: Mostly insectivorous (ants, beetles, crickets, spiders). Larger species eat small mammals, birds, eggs, other lizards, and even carrion (Komodo dragon eats deer and water buffalo)
Behavior: Most are diurnal (active by day). Many are territorial – males display push-ups, head-bobbing, and dewlap extensions (iguanas)
Defense mechanisms:
Tail autotomy: Shedding tail to distract predators (regrows later)
Camouflage: Color-changing (chameleons, anoles)
Venom (Gila monster, beaded lizard – rare)
Inflation (thorny devil, frilled-neck lizard)
Special adaptations:
Flying lizards (Draco): Glide using rib-supported wing-like flaps
Geckos: Sticky toe pads (millions of microscopic hairs) to climb smooth surfaces and even walk upside down on glass
Chameleons: Independently moving eyes, lightning-fast tongue (longer than body) to catch insects
Horned lizards: Shoot blood from their eyes to confuse predators
Reproduction: Most lay eggs (oviparous), some give live birth (viviparous – common in cold climates). Some species reproduce parthenogenetically (all-female, no males needed)
Lifespan: 2–10 years (small species) | 10–30 years (large species) | Komodo dragon up to 30 years
Largest species: Komodo dragon (3 m / 10 ft, 70 kg / 150 lbs)
Smallest species: Dwarf gecko (1.6 cm / 0.6 in, 0.1 grams)
Conservation status: Many species are threatened by habitat loss, invasive species, and pet trade

Status	Examples
Critically Endangered	St. Croix ground lizard, Utila iguana
Endangered	Galápagos pink land iguana, Fiji crested iguana
Vulnerable	Komodo dragon, various chameleons
Least Concern	Most geckos, anoles, skinks

Biggest threats: Habitat destruction (deforestation for palm oil, agriculture), illegal pet trade, climate change (affects egg incubation temperature that determines sex in many species), invasive predators (cats, rats eating eggs and young)
Fun fact 1: A group of lizards is called a “lounge” or “lounge of lizards.”
Fun fact 2: The Komodo dragon has venom glands (discovered in 2009) – not just bacteria in its mouth as previously believed.
Fun fact 3: Geckos can cling to surfaces because of van der Waals forces – millions of microscopic hair-like structures (setae) that create molecular attraction.
Fun fact 4: The thorny devil (Australia) collects water on its spiky body and channels it to its mouth using capillary action.
Fun fact 5: Several lizard species are parthenogenetic (all-female). The New Mexico whiptail reproduces entirely without males.
Fun fact 6: The green basilisk lizard runs on water – called the “Jesus Christ lizard” – for up to 5 meters (15 feet) before sinking.
Fun fact 7: Some lizards can live without food for months (slow metabolism). Gila monsters store fat in their tails.

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