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Crazy Cuckoos!
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Crazy Cuckoos!

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Transcript

  • 1. Parasitism Hidden predators
  • 2. Introduction • Parasitism is a symbiotic relationship in which one organism benefits while the other is harmed • Common Parasitic Organisms – Fleas, ticks, tapeworms, roundworms
  • 3. Human Parasites • When we think of a parasite we normally think of small things that live inside or on other organisms – Ticks, Ascaris – a roundworm that can live in the human small intestine when food is ingested that is contaminated with their eggs
  • 4. Cuckoos are parasites! • Yes Birds can be parasites! Cuckoos are a special type of parasite called a BROOD PARASITE
  • 5. Reed Warbler feeding a Common Cuckoo chick in a nest. Notice the size difference…. One of these things is not like the other…
  • 6. Murderer! • Female Cuckoos watch the behavior of the Reed Warblers as they build their nests and start their broods. • At the appropriate moment the mamma Cuckoo flies down to the reed warblers' nest, pushes one Reed Warbler egg out of the nest, lays an egg and flies off!
  • 7. Sibling Rivalry • Cuckoo chicks methodically evict all host progeny from host nests. It is a much larger bird than its hosts, and needs to monopolize the food supplied by the parents.
  • 8. Push It! • The Cuckoo chick will roll the other eggs out of the nest by pushing them with its back over the edge. • If the Reed Warbler's eggs hatch before the Cuckoo's egg, the Cuckoo chick will push the other chicks out of the nest in a similar way. • Once the Reed Warbler chicks are out of the nest, the parents completely ignore them.
  • 9. Other Brood Parasites • A Shiny Cowbird chick being fed by a Sparrow