Chamaeleonidae (Chameleons)

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Appearance: Chamaeleons are probably best known for their ability to change colors. Apart from that, they have a number of other characteristics that make them the most easily recognizable lizards: their body is laterally compressed and their heads often possess extensively developed horns and crests. Their tail is prehensile and 2 or 3 of their toes are fused to form grasping pads, making them ideally adapted to arboreal life. Chameleons can move their eyes independently and through their position on protruding cones they have three-dimensional vision when they look ahead. This allows them to focus their prey ahead of them. By means of their extremely elongated and protractable tongue they can catch prey at a distance corresponding to their own body length.

Distribution: Most members of the family occur in Africa and Madagascar, but a few species can be found in the Middle East, Asia, and Southern Europe.

Habitat: mostly arboreal; from desert areas to tropical rain forests. Brookesia species are somewhat untypical chameleons in that they are ground-dwellers without prehensile tails.

Size: from 2.5 cm (Brookesia sp.) to more than 50 cm (Chamaeleo melleri, Furcifer oustaleti).

Food: mostly insectivorous, large species may prey on vertebrates too.

Behaviour: diurnal, arboreal, slowly-moving lizards; territorial.

Reproduction: Most chameleons are egg-laying (oviparous), but some give birth to living offspring (e.g. Chamaeleo ellioti, picture above).

Family Acrochordidae (Wart Snakes)

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Only 3 species belong to this family

Appearance: Heavy-bodied snakes with skin lying loose in folds. Scales small, granular and non-overlapping, giving a rugose texture with the interstitial skin forming bristle-tipped tubercles. Adapted to aquatic lifestyle by dorsally-shifted eyes, valvular nostrils, and a flap for closing the lingual opening of the mouth. Acrochordus granulatus has a laterally compressed tail and lingual salt glands.

Size: 60-180 cm snout-vent length.

Distribution: Indo-Australian region

Habitat: Aquatic; estuarine-marine (Acrochordus granulatus) or living in freshwater (A. arafurae, A. javanicus).

Food: mainly fish.

Reproduction: Ovoviviparous with litters ranging from 2 to 32 neonates (A. javanicus). Clutch size is correlated with body size. Acrochordus granulatus: 4-8 neonates.

Behavior: Slowly moving and swimming animals which often remain under water for a considerable time. On land they can move only clumsily

Taxonomy: The systematic status of the Acrochordidae has been unclear for many years: some authors placed them within the colubrids (as a subfamily), others such as UNDERWOOD (1967) placed them within the Henophidia. More recent authors placed the acrochordids within the caenophidian radiation

Family Chelydridae (Snapping Turtles)

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The family Chelydridae contains only three species in three monotypic genera

Appearance: Chelydrids are large freshwater turtles with massive heads. Their head is indeed so big that it cannot be retracted fully within the shell. The same is true for their limbs. The carapaces of chelydrids are flattened, triridged, and nearly rectangular in outline, and the plastrons are reduced. The three species have unusually long tails, almost equaling the length of their carapaces.

Size: Macrochelys (formerly Macroclemys) is one of the heaviest freshwater turtles worldwide (max. carapax length 80 cm, max. weight 80 kg).

Distribution: North America (Chelydrinae), China and Indochina (Platysterninae).

Relationships: Platysternon has been considered as a member of the Testudinidae or as a separate family, Platysternidae.

Habitat: Chelydra serpentina inhabits both freshwater and brackish water. Macrochelys lives in rivers, lakes and swamps

Food: Mostly carnivorous (preys include fish, molluscs, worms and other aquatic invertebrates); Chelydra serpentina is an omnivorous species.

Behaviour: Mostly nocturnal foragers. Macrochelys lures fish into its open mouth with a fleshy projection of the tongue that mimics a wormlike prey.

Family Agamidae (Agamas)

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Appearance: A number of agamids developed highly specialized adaptions like the genus Draco which is the only lizard genus that has evolved a gliding flight made possible by elongate ribs which support a flight skin. Chlamydosaurus has large frills and several genera show enlarged scales all over the body (e.g. Moloch) or all over the tail (like Uromastyx). In contrast to most lacertids, many agamids don't autotomize their tails. However, members of the genera Agama, Physignathus, and Laudakia have evolved intervertebral autotomy ans opposed to the commonly found intravertrebral autotomy found in other lizard families.

Femoral pores have been lost in the amphibolurine (sensu Macey et al., 2000) genera Chelosania, Moloch, and Hypsilurus, and all draconines and agamines.

Distribution: Africa, Asia, Europe, Australia and several Indoaustralian islands.

Size: moderate-sized to large

Behavior: mostly diurnal and terrestrial.

Food: Insects and other small animals. Some species are partly herbivorous (plant-eating), e.g. Uromastyx. Moloch is also peculiar in that it feeds primarily on ants.

Reproduction: Most species are oviparous with the exception of Phrynocephalus which gives birth to living offspring.

Relationships: Agamas are related to iguanas and chameleons and these families have been included in the superfamily Iguania.

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