Overview
This lecture describes the harsh survival tactics and predator-prey interactions among early dinosaurs (Coelophysis), cynodonts, and other prehistoric animals during a challenging dry season.
Survival Strategies of Cynodonts
- Cynodonts face threat from Coelophysis dinosaurs digging up their nest.
- As Coelophysis approach, cynodont parents eat their own young to deny food to predators and facilitate escape.
- The parent cynodonts abandon the nest at night to avoid predation.
Behavior and Adaptation of Coelophysis
- Coelophysis are persistent, returning to the nest area the next day, unable to find their prey.
- The dry season forces Coelophysis to search for new food sources like lungfish hidden in riverbeds.
- Their serrated teeth allow them to breach the lungfish's protective cocoon.
Social and Predatory Behavior of Coelophysis
- Increased numbers of Coelophysis lead to competition and confrontations among themselves.
- They begin to hunt collaboratively, targeting larger and wounded prey.
Attack on Postosuchus
- A wounded female Postosuchus, unable to use her back legs but still dangerous, is targeted by Coelophysis.
- Despite her strength and armor, the pack overwhelms her and consumes her from the inside out.
Key Terms & Definitions
- Cynodont — Early mammal-like reptile, ancestor to modern mammals.
- Coelophysis — Small, agile carnivorous dinosaur with serrated teeth.
- Postosuchus — Large, heavily armored Triassic reptile, apex predator of its environment.
- Lungfish — Ancient fish capable of surviving dry seasons by encasing itself in mud.
- Serrated teeth — Saw-like teeth adapted for slicing flesh.
Action Items / Next Steps
- Review adaptations of Triassic animals for survival and predation.
- Prepare for discussion on evolutionary pressures in prehistoric ecosystems.