African Reptiles Interpretive Guide

Transcription

1 African Reptiles Interpretive Guide Exhibit Theme: Not all animals make good pets; in fact, our enthusiasm for keeping them can hurt their populations in the wild. Common Threat: Over collection for the pet trade Both African spur-thigh and leopard tortoises are collected from the wild to be sold as pets. They are most often collected as juveniles and are unable to reproduce before they are caught. This slows population reproduction rates, making it difficult for populations to replenish their numbers. Exhibit Conservation Message: Not all animals are good pets for everyone. Tortoises may look cute when they are young and small, but they live for many years, require a lot of care and can grow quite large. Conservation Ask: Be a responsible pet owner Don t support the wildlife pet trade; if you decide that you want an exotic pet, make sure you acquire it from a responsible breeder. Make sure you can properly care for the animal; consider housing, diet, temperature requirements and the species lifespan. If you can no longer care for a pet, do not release it into the wild. Relevant Conservation Partners: Turtle Survival Alliance The TSA s mission is to transform passion for turtles into effective conservation action through a global network of living collections and recovery programs. Recommended Biofacts: Egyptian tortoise shell 4/11/2016 African Reptiles Interpretive Guide The Maryland Zoo

2 Egyptian Tortoise Shell Recommended Biofact Possible Hooks: What does a tortoise use their shell for? Would you like to feel a tortoise shell? Do you think a tortoise can walk out of its shell? Description: Carapace made of bone, covered in keratin scutes (modified scales) o Shed and re-grow scutes as the tortoise or turtle grows Avoids predation by withdrawing into the shell Fun Facts : African spur-thigh tortoises are the largest mainland tortoise species The leopard tortoise is the fourth largest tortoise species in the world Turtles and tortoises are connected to their shells by their spine! They cannot walk out of their shell. Turtle vs. Tortoise: Domed carapace Thick, sturdy legs Lives on land Tortoise Turtle Streamlined carapace Webbed feet Lives in the water 4/11/2016 Egyptian Tortoise Shell The Maryland Zoo

3 Leopard Tortoise Geochelone pardalis Description Size: o Carapace length: cm; average 45 cm (18 in) Weight: o kg; average 18 kg (40 lbs) Physical Description: o Base color of the carapace may be tan, yellow, or sometimes shades of dusty brown. The intensity of shell patterning varies. Blotches on the shell are most often black and are typically only present on juveniles. The head, feet, and tail vary in color but are usually tan to brown. o Scutes often grow in a pyramid shape; a common shell deformity among leopard tortoises called carapacial pyramiding Sexual Dimorphism: Males are slightly larger than females In the Wild Habitat and Range Range: o Widely distributed through sub-saharan Africa Habitat: o Broad ecological tolerance; ranging from dry arid plains to temperate grassland ecosystems and have also been found in mountainous terrain Most often found in dry shrub habitat with low lying vegetation Diet Herbivorous: o Most tortoise species eat grasses, although leopard tortoises primarily eat forbs (herbaceous flowering plants, excluding grasses), as well as berries and succulents. Obtains water mostly from the plants that they eat, particularly succulents Adaptations Camouflage and a thick heavy shell provide protection from predators Turtles do not have ears, but can sense vibrations that help them navigate their environment. A keen sense of smell helps them locate food Tear and bite food with hard, sharp, beak like mouths Large anal sacs in the abdominal cavity store large amounts of water; an important adaptation for living in an arid environment 4/11/2016 Leopard Tortoise The Maryland Zoo

4 Leopard Tortoise Geochelone pardalis Social Structure Typically solitary outside of the breeding season Lifespan/Life Cycle Wild: Unknown Captivity: years Ecosystem relationships Predators: o Adults are rarely killed by predators; their shell affords them great protection. o Eggs and hatchlings are eaten by a wide variety of predators, including foxes, coyotes, and mongooses. o Humans occasionally eat adult leopard tortoises Important seed dispersers o Ingest a large number of seeds while foraging, which they then redistribute through defecation Reproduction Breeding season: May through October Behavior: o Males and females become aggressive when searching for a mate. Males establish dominance through aggressive behavior, such as butting and ramming into rivals During courtship, males follow females and repeatedly run into them. o Nesting: After successful mating, the female searches for a suitable nest site She excavates the nest by kicking away loose dirt; up to 12 inches deep Frequent urination in the dirt may help moisten the dirt, making it easier to dig Clutch Size: Ranges from 5-30 eggs o Larger females lay more eggs o Can lay 5-7 clutches in a single breeding season, about 3-4 weeks apart Incubation: The period of incubation ranges from approximately 5 months to over a year. o Temperature-dependent sex determination: the temperature of the eggs can affect the sex of the developing tortoise. Warm environment favors females Cooler environment favors males Maturation: Hatchlings grow rapidly and there is no parental care Activity: Crepuscular o Most active early in the morning and again in the evening, when temperatures 4/11/2016 Leopard Tortoise The Maryland Zoo

5 Leopard Tortoise Geochelone pardalis are more moderate o Seek shelter during hottest and coldest parts of the day Other Fun Facts : Fourth largest tortoise species in the world Most widely distributed tortoise species in Africa Tortoises occasionally eat bone fragments, soil and stones. It is thought that these items are eaten to supplement their diet with minerals such as calcium. Conservation Status and Threats: Listed as a species of Least Concern by the IUCN Redlist Listed by MZIB as stable Protected under CITES Appendix II Threats: o Collection for the pet trade o Hunted for food and medicine Leopard tortoises are a food source for indigenous people. Sometimes used in traditional medicine At the Zoo The Zoo has 3 leopard tortoises on exhibit o Two males: Gossamer and Gremlin One weighing about 22 lbs and about 29 years old (in2014) One weighing about 11 lbs and about 13 years old (in 2014) o One female: Fern 24 lbs, more than 29 years old What We Can Do Make environmentally responsible lifestyle decisions to help conserve habitat - conserve energy and resources, reduce litter and pollution Support the conservation efforts of local organizations like The Maryland Zoo as well as organizations working in the field to protect wildlife and conserve habitat. Learn more about them, spread the word, and consider donating or getting involved. o Turtle Survival Alliance: The TSA is comprised of many zoo professionals and conservationists working together to transform passion for turtles into effective conservation action through a global network of living collections and recovery programs. 4/11/2016 Leopard Tortoise The Maryland Zoo

6 Leopard Tortoise Geochelone pardalis Be a responsible pet owner - not all animals make good pets for everyone, make sure that you know how to properly care for an animal before getting it as a pet o If you can no longer care for a pet, do not release it to the wild. Not only will that captive animal struggle to survive in a wild environment, it can negatively affect native wildlife and possibly spread captive diseases to the wild population. If you decide that you want an exotic pet, make sure that you acquire it from a responsible breeder - don t support the wildlife pet trade References: Animal Diversity Web: The Maryland Zoo website: IUCN Redlist: 4/11/2016 Leopard Tortoise The Maryland Zoo

7 African Spur-thigh Tortoise Geochelone sulcata Description Length o Average about 18 in (45 cm), but can reach in (2-2.5 ft or cm) Weight o Average about lbs (31-45kg) o Can reach up to 240 lbs (105 kg) Physical Description: o Largest of the African mainland tortoises (only Galapagos tortoises are larger) o Yellow to brown carapace o Prominent growth rings on scutes o Large overlapping scales on front legs o Two or three large, conical spurs on hind legs; function is unknown Sexual dimorphism: o Males have slightly longer, thicker tails and a more concave plastron In the Wild Habitat and Range Range: Central Africa, from Southern Sahara, Senegal, Mauritania, Mali, Nigeria, Sudan, Chad to Ethiopia Habitat: Hot and arid; desert fringes, dry savannas, deciduous bushland o Native to the Sahara Desert and the Sahel, a transitional eco-region of semi-arid grasslands, scrub, and savannah in northern Africa Diet Herbivorous: grasses, weeds, cactus Rarely, if ever, drinks water needs are met by the water in the plants that it eats Adaptations Coloration provides excellent camouflage Avoids predation by withdrawing completely into their shells, leaving only the front surfaces of their scaled forelegs and the soles of their back feet showing Bask in the morning to raise their body temperature after lower nighttime temperatures Well adapted for burrowing: strong forelimbs, claws o Keeps them cool o Avoids dehydration o Hatchlings may use small mammal burrows instead of digging their own Move slowly to conserve energy: can go for long periods of time without eating Social Structure: Spur-thigh tortoises are very aggressive towards each other, even as hatchlings. 4/11/2016 African Spur-thigh Tortoise The Maryland Zoo

8 African Spur-thigh Tortoise Geochelone sulcata o Ramming into each other and attempts to flip each other over are common male behaviors Lifespan In the wild: 50 years In captivity: years Ecosystem Relationships Few predators Young often depend on small mammal burrows until they are large enough to dig their own. Herbivorous; likely to impact plant communities in their ecosystem Reproduction Breeding season: Anytime from June-March, but most frequently after the rainy season in September through November Behavior: o Very aggressive toward each other, particularly during the breeding season Males ram other males and females Attempt to flip each other Male circles around the female and occasionally rams her with his shell o Nesting occurs in the fall The female searches for a suitable nest site, for as long as two weeks She excavates the nest by kicking away loose dirt Frequent urination in the dirt may help moisten the dirt, making it easier to dig Nest is about 2 ft wide and 3 to 6 inches deep and can take up to 5 hours to dig. Female may dig several nests before selecting one to lay eggs in Clutch size: Clutch size is eggs, sometimes more. o Once she decides to lay, one egg is laid every 3 minutes Incubation: Eggs hatch after about 8 months Maturation: o Hatchlings are about 2-3 inches long o No parental care Activity Crepuscular: Most active early in the morning and again in the evening, when temperatures are more moderate o Retreat to a burrow during the hotter and colder parts of the day; when the temperatures are too hot or too cold for them. 4/11/2016 African Spur-thigh Tortoise The Maryland Zoo

9 African Spur-thigh Tortoise Geochelone sulcata Other Fun Facts : In some parts of Africa, the spur-thigh tortoise is culturally significant o Symbol of virtue, happiness, fertility, longevity o Regarded as a mediator between man and the gods Threats and Conservation Status IUCN: Vulnerable CITES Appendix II with a zero annual export quota for specimens removed from the wild and traded for primarily commercial purposes. This is difficult to enforce however, because it is hard to differentiate between wild-caught and captive bred tortoises Threats: o Habitat loss and degradation, overgrazing and desertification o Over collection for the pet trade Juveniles are typically collected Take 15 years to reach maturity, so populations may not be able to recover from over collection At The Zoo 1 male: Dozer 3 females: Clover, Buttercup, Sweet Pea What We Can Do Make environmentally responsible lifestyle decisions to help conserve habitat conserve energy, reduce consumption, recycle and reuse whenever possible, reduce litter and pollution Support the conservation efforts of local organizations like The Maryland Zoo as well as organizations working in the field to protect wildlife and conserve habitat. Learn more about them, spread the word, and consider donating or getting involved. o Turtle Survival Alliance: The TSA is comprised of many zoo professionals and conservationists working together to transform passion for turtles into effective conservation action through a global network of living collections and recovery programs. Be a responsible pet owner - not all animals make good pets for everyone, make sure that you know how to properly care for an animal before getting it as a pet o If you can no longer care for a pet, do not release it to the wild. Not only will that captive animal struggle to survive in a wild environment, it can negatively affect native wildlife and possibly spread captive diseases to the wild population. 4/11/2016 African Spur-thigh Tortoise The Maryland Zoo

10 African Spur-thigh Tortoise Geochelone sulcata Do not support the illegal pet trade. The illegal pet trade contributes to the population decline of many tortoise species. References and Additional Resources Cogger, H.G. and Zweifel, R.G.(2003). Encyclopedia of Reptiles and Amphibians, 3rd d Edition. San Francisco, CA: Fog City Press 4/11/2016 African Spur-thigh Tortoise The Maryland Zoo