In the penultimate episode of Crash Course Zoology, we use everything we've learned so far to try and figure out what a "species" even is anyway! As you'll see, the incredible diversity of animals ...

“Communication is something that animals do; it’s fundamental to what it is to be an animal,” says Arik. A lot of the time that communication is vocal. “Sound is just a really good way to get your ...

Life depends on genes being switched on and off at exactly the right time. Even the simplest living organisms do this, but usually over short distances across the DNA sequence, with the on/off switch ...