reptiles of the Galapagos

The islands are named after a saddle (the Spanish word), based upon the shape of the shell of some of the tortoises, which have evolved to be able to stretch their necks up high, to get the juicy leaves from the cactus that has evolved long trunks to keep the leaves up high out of reach of normal tortoises ... I do not have any particular interest in tortoises but they are hard to avoid in the Galapagos Islands.

Now there are only some estimated 30,000, and this following plenty of work by conservationists to breed and reintroduce them to parts where they had died out.  It is estimated that when Darwin visited the islands there were 250,000 there.  But people came and hunted them, with ships filling their holds with them, stacked alive and upside down, as they would stay alive like that for up to a year, providing a store of fresh meat for the sailors.  Away from such a cruel end they are long-lived - one taken by Darwin in 1835 only died (in Queensland zoo) in 2003.  They are also quite fascinating - did you know that as youngsters it is not possible to determine their sex, but that when they mature, in males the undershell changes to a concave shape (to enable them to mount a female), the tail grows longer and the penis migrates from its internal position to the end of the tail?

But I much preferred the iguanas, both the land and the marine varieties.  The land ones mostly seem to have a kind of smile on their face (although this one looks quite grumpy) and are very pretty, in varying patterns of cream, yellow and black.

The marine iguanas were more ferocious looking, although mostly just laying around in big heaps trying to keep warm (this being the cold season in the Galapagos as the Humboldt current brings cold water up from the southern oceans).  They are black in colour, however those from Española (Hood) Island are much more colourful, particularly during the breeding season, and some appeared to have come into season early.  This made them more aggressive towards other males too, so quite entertaining to watch!

I was very keen to see a snake or two as well (I'm sure you've all seen the BBC footage of the snakes hunting the young iguana!), although not hopeful as they are not seen all that often.  But we were lucky and saw three snakes, one long black Fernandina snake and two stripey Galapagos racers.  The first snake we saw was out in the open, seemingly basking in the late afternoon sun.  We discussed whether or not it was actually alive, this being highly unusual behaviour, when a mockingbird came along to cause trouble.  It pecked at the tail end of the snake, lifting that end up, and the snake - clearly very much alive - reared up at it.  They are very mildly venomous, apparently, but kill their prey through constriction.  A battle ensued, with the bird continually pecking at the snake, seemingly trying to drag it even further into the open, whilst the snake tried to fend off the bird whilst moving towards cover.  We moved on once the snake had safely made it to the cover of a bush, although the mockingbird was still hanging around.  Wish I'd thought to video it, as my replacement camera did not take good enough photos, but these three blurry, washed out pictures give some idea of what the interaction looked like: