10/29 Speciation

https://ib.bioninja.com.au/standard-level/topic-5-evolution-and-biodi/51-evidence-for-evolution/speciation.html

Today we discussed speciation and the complexities of determining what is a species and what is not!

A few questions I was left with are:

1) Where/when do subspecies come into play?

2) When the news says a new species has been discovered what parameters are being used?

3) At what point do we conclude that there is sexual dimorphism? Do all of the males need to have a certain characteristic (for example: the fancy trait in the Cornell Ornithology Lab video) or can some males exist without the characteristic?