What is Good
Wednesday, 15 September 2010
Antlers
Tuesday, 14 September 2010
Jupiter
Monday, 13 September 2010
Jupiter
Thursday, 9 September 2010
Maps
Wednesday, 8 September 2010
Giant Tortoise
Here is a picture of a Galapagos Giant Tortoise with a new born. Seventy may seem rather old to be reproducing, but the Galapagos tortoise doesn't reach sexual maturity until it is 25.
Mating can occur at any time during the year, and the female tortoise can produce between two and 16 tennis ball-sized eggs, which she buries in a 1ft deep nest.
They then incubate for around 130 days. Unusually, temperature can effect the gender of the hatchlings. A low nest temperature means they are likely to be male, while a hot, stuffy nest is more likely to produce females.
However, it is impossible to determine the sex of a Galapagos tortoise until it is 15 years old.
Growth will occur slowly over the next 40 years, at which point the tortoises reach full size. Their large shells add to their impressive appearance and act as a shield against predators.
This magnificent armour is actually a bone, and a crucial part of the tortoise skeleton. However, it does slow them down, as they have an average speed of only 0.18mph.
No one knows why the Galapagos reptiles are so large, but it's possible that a lack of predators on the South American islands meant they evolved free from danger.