What are murre eggs?
Common murre eggs are large (around 11% of female weight), and are pointed at one end. The egg’s pyriform shape is popularly ascribed the function of allowing the egg to spin on its axis or in an arc when disturbed, however there is no evidence to support this claim.
How are the eggs of Murres adapted to where they are laid?
Murre eggs are pointed at one end, which makes them roll around in a circle, if disturbed. This is a perfect adaptation when any mishap could cause their egg to fall off the rocky cliffs into the ocean below.
What is the advantage of a Pyriform shaped egg?
Two recent alternative hypotheses suggest that a pyriform egg confers mechanical strength and minimizes the risk of dirt contamination of the blunt end. We present a new hypothesis: that the Common Murre egg’s pyriform shape confers stability on the breeding ledge, thus reducing the chance that it will begin to roll.
Why do Murres have pointy eggs?
Pointy eggs are more stable on sloping cliffs because more of the egg is in contact with the cliff. Murres are colonial species, and usually breed in large dense groups as a way of defending eggs and chicks against aerial predators such as gulls.
What are guillemot eggs?
Guillemots are sea birds that reside in crowded colonies on rocky cliff sides. When they breed, they produce one conical egg which incubates for around 30 days on the precarious cliffside… but guillemots don’t make nests.
Why are guillemot eggs pointed?
Further research by scientists shows that the shape of guillemot eggs could be to stop them falling from their nests after all. Everyone knows guillemots’ pointy eggs are shaped to roll in an arc to stop them falling from their cliff-ledge nests.
What is a puffin egg?
A puffin chick is called a puffling. Puffins lay one egg that is incubated in turn by each adult for approximately 39-43 days (about six weeks!). After the egg hatches, the chick—called a puffling—stays in the burrow and awaits food from its parents.
https://www.youtube.com/watch?v=e-189LIYa0Y