| Category | : Documentary | | Added on | : 25/01/2008 11:01:32 | | Added by | : heil | | Downloads | : 9 | | Archive password | : www.megapid.net | | Total size | : 723 MB | | Description | : |
Broadcast 14 December 2005, the penultimate episode
focuses on the relationships between invertebrates and plants or other animals. It begins with ants and
aphids: the former `herd` the latter and protect them in return for secreted honeydew. The activities of
gall-inducing insects are described, using the example of the oak tree. Many plants recruit insects to aid
pollination, offering nectar for doing so, and some predators have adopted camouflage to take advantage of
this, such as the crab spider. Stick insects rely on ants to hide their eggs underground for them in safety.
In the Californian desert, the blister beetle`s larvae congregate on a stem and, by releasing a pheromone,
attract a male digger bee on the lookout for a female. They climb aboard their visitor and eventually transfer
to its mate, which will in turn unwittingly deposit them in its nest — providing sustenance. An orchard
spider is shown enduring a parasitic wasp grub, which injects its host with a hormone that deranges it and
halts the spinning of webs. The grub then sucks the liquid from the spider`s body and uses the remaining silk
to form its cocoon. Fairy wasps are so small that they can lay their eggs inside those of water beetles
— and can even mate while inside them. The tiger beetle larva ambushes ants by plugging its burrow with
its head and pouncing. However, this doesn`t work with methoca, an ant-like wasp, which can overcome the
beetle and inject it with poison.
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