Clownfish are adapting to warming oceans by shrinking in size during heat waves, as observed off the coast of Papa New Guinea. Scientists found that 101 out of 134 clownfish monitored in Kimbe Bay shrank due to heat stress, which may help them conserve energy. This behavior is a new coping strategy for coral reef fish, similar to other species like marine iguanas. The shrinking is temporary, and clownfish can grow back when conditions improve, demonstrating resilience in the face of climate change.