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Platypus (Amniote) Presentation
Transcript of Platypus (Amniote) Presentation
Uses bill receptors to detect electric currents Platypus Ornithorhynchus anatinus Kingdom:
O. anatinus Taxonomy Evolution Characteristics http://news.nationalgeographic.com/news/2008/05/080507-platypus_2.html
Hawkins, M., and Battaglia, A. (2009). Breeding behaviour of the platypus (Ornithorhynchus anatinus) in captivity. Australian Journal of Zoology 57, 283–293. Sources Melissa Buse, Kevnea Cain,
Matthew Cunningham, Samantha Jansen The Platypus is the sole living representative of its family and genus. Discovered in 1797
Thought to be a hoax
Endemic to eastern Australia Behavior And a snake have in common!? What do... A Cow... A beaver... THE PLATYPUS! Feeding Behavior They eat 15-30% of a their body weight each day
Feed on freshwater invertebrate
Stores food in cheek pouches
Grinds food using rough pads inside bills Social Behavior Solitary animals Come together to breed once a year
Males take no part in raising young, and leave immediately after mating. A duck.... One of only 5 mammals to lay eggs instead of giving live birth
Has 10 sex chromosomes Bill- like a duck
Electrolocation- like a shark
Webbed feet- like an otter Semiaquatic carnivore- like an opossum
Flattened tail- like a beaver
Lays eggs - like a bird
Breast milk- like mammals
Venomous spurs - like a snake Earliest offshoot of mammalian family tree (166 million years ago) Research Study Purpose of the Study To understand :
The breeding behavior of the platypus
The breeding process to facilitate future breeding in captivity.
Compare findings to other breeding studies both in captivity and in the wild. Materials and Methods Mating Results! Importance of the Study Who
3 platypuses, 1 male and 2 females, wild-caught as juveniles.
Platypus behaviors studied over 3 breeding seasons at the Taronga Zoo in Australia.
5 pools linked by waterfalls, logs, tunnels, and burrowing spots Breeding behaviour of the platypus
(Ornithorhynchus anatinus) in captivity What
Fed live invertebrate food
The nesting boxes were checked each day by monitoring video
Trained volunteers performed direct observation of the platypuses in breeding burrows Mating
Occurred between September 10th and November 10th during 2001-2007
Between 1 male and 1 female
No mating with female 2, but they did interact
Included swimming together, tail biting, and nuzzling Nesting Results! After nesting
Female would spend active periods floating in the pools or foraging
Then return to the burrow to lay eggs “Then the male forcibly curled his tail under the female’s belly and changed his position so his head lay over the female’s shoulder and her tail was clasped between his hind feet. Once intromission was achieved the female continued to drag the male as she swam and he stroked her laterally across her head and back and they remained conjoined for up to 20 min.” Female determined the burrowing site
Week between mating and nesting
Collection of nesting materials
Began 6-8 days after the last observed contact with the male, and lasted for 2-5 days. Pregnant female
Average of 14 hours in the burrow for 6-7 days
Unsuccessfully bred female
Average of 14.7 hours per day in the burrow site even though she was not there to lay eggs.
The work that the female puts into collecting the materials is a useful behavioral tool to determine breeding progress. The platypus is a secretive animal so their breeding behaviors and patterns have gone unknown for quite some time. It is important to understand these behaviors to track population sizes and demographics over time.
Previous research has never shown what happens inside the burrow. The newly discovered knowledge will help better facilitate breeding of the platypus in captivity and help the species thrive. Gestation and Incubation Times Gestation is estimated to be 15-21 days.
Female would spend long stretches in the burrow for two periods of time
1st stretch lasting 80-94 hours
2nd stretch lasting 50-70 hours. The female would leave the burrow for only short amounts of time during these stretches.
After 2nd stretch, the intervals spent in the burrow began to shorten, until the female left the burrow daily.
These intervals suggest that incubation is less than 12 days. Fig. 4. In-burrow stay durations. Changes in the female platypus’s breeding burrow behaviour during the incubation and juvenile development periods from retirement to emergence. The data from this study of three breeding successes (TZ) are compared with data from the 1998–99 breeding at Healesville Sanctuary (HS). After Birth Time in Burrow Emergence Table 4. Burrow occupation during lactation and juvenile development
The differences in female behavior at the breeding burrow between early and late stages of juvenile development All juveniles emerged independently from the burrow at night
The day following emergence the juveniles all made their way back to the burrow Table 5. A comparison of data on juvenile emergence Margaret Hawkins A B and Adam Battaglia A