Biology Project
Texte du Storyboard
- Large MouthSmall Body
- Key
- Cane Toad
- Small MouthLarge Body
- There are two different types of snakes in this habitat. One has a large mouth and a small body and the other has a small mouth and a large body. Both of these feed on Cane Toads (Bufo marinus) which contain the poison, bufotoxin. Snakes need a certain amount of this poison to be killed, and the bigger the snake, the more poison is needed.
- Due to snakes being "gape-limited predators", snakes with bigger mouths can eat bigger prey at one time, and snakes with smaller mouths can only eat smaller prey. This means that the snakes with smaller bodies would eat the bigger toads that have more bufotoxin since their head was bigger.
- This would then cause the snakes with the smaller bodies to consume more poisonous bufotoxin and cause them to die, while the snakes with smaller mouths but bigger bodies would not be affected by the small amounts of bufotoxin that they were consuming.
- ✖
- ✖
- Now that most of the snakes with big mouths and small bodies have died off, the habitat is mostly filled with snakes that have small mouths but big bodies since they are more fit and able to reproduce.
- Only surviving snakes could reproduce and since most of the surviving snakes are the ones with small mouths and large bodies, they are more likely to pass this trait onto their offspring which causes the majority of the population to contain the trait of a small mouth and large body.
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