Additional information needed in summarise(nAlive = n())?

Question

this is my first post and I am fairly new to R so please have patience and ask for any other info needed. I will be as thorough as I can.

So, I have a question about this set of code

Alive<- JulyData%>%
    filter(!is.na(Lice))%>%
    group_by(Cage, Species)%>%
summarise(nAlive=n())

Do I need to include anything in the line summarise(nAlive = n()) or is this perfectly acceptable? The n() seems like it is lacking something but I am not sure.

I am trying to count the number of alive specimens grouped by cage and species.

Here is the full code I am working with for reference:

library(readxl)
library(tidyverse)
library(lme4)
library(car)
library(emmeans)

JulyData<- read_excel("~/R/Cage Data Final 2016 EMV 1.20.xlsx", sheet="7.1.2016")
  str(JulyData)
summary(JulyData$Lice)

AllCages<- distinct(JulyData, Cage, Species)
  AllCages$nStart<- rep(10,nrow(AllCages))

Alive<- JulyData%>%
    filter(!is.na(Lice))%>%
    group_by(Cage, Species)%>%
summarise(nAlive=n())