A recent conversation overheard between Colin and his daddy ...
Colin: "Does Colin have heartbeat?"
Kevin: "Yes, Colin, you have a heartbeat, right here." (Kevin points to the left side of Colin's chest.)
Colin: "Does Daddy have heartbeat?"
Kevin: "Yes, I have a heartbeat."
Colin: "Does girls have heartbeat?"
Kevin: Yes, girls have a heartbeat.
Colin: "Does Urmila have hearbeat?" (Urmila was one of Colin's favourite caregivers at his daycare.)
Kevin: "Yes, Urmila is a girl. She has a heartbeat."
Colin: "Does Fanny have heartbeat?" (Fanny is the cat.)
Kevin: "Yes, Fanny has a heartbeat." Colin pauses for a long moment and looks up to Kevin with concern.
Colin: "... Does Mama have heartbeat?"
I'm glad to know that in Colin's taxonomy I fall somewhere between girls and cats.