skylark.md

@species Skylark begin
    const movementrange::Length = 500m #XXX arbitrary
    const visionrange::Length = 200m #XXX arbitrary

    const eggtime::Int64 = 11 # days from laying to hatching
    const nestlingtime::Int64 = 9 # days from hatching to leaving nest
    const fledglingtime::Int64 = 21 # days from leaving the nest to independence

    #XXX predation mortality should be habitat-dependent
    const eggpredationmortality::Float64 = 0.03 # per-day egg mortality from predation
    const nestlingpredationmortality::Float64 = 0.03 # per-day nestling mortality from predation
    const fledglingpredationmortality::Float64 = 0.01 # per-day fledgling mortality from predation
    const firstyearmortality::Float64 = 0.38 # total mortality in the first year after independence
    const migrationmortality::Float64 = 0.33 # chance of dying during the winter

    const minimumterritory = 5000m² # size of territory under ideal conditions
    const mindistancetoedge = 60m # minimum distance of habitat to vertical structures
    const maxforageheight = 50cm # maximum preferred vegetation height for foraging
    const maxforagecover = 0.7 # maximum preferred vegetation cover for foraging
    const nestingheight = (15cm, 25cm) # min and max preferred vegetation height for nesting
    const nestingcover = (0.2, 0.5) # min and max preferred vegetation cover for nesting

    const matefaithfulness = 0.5 # chance of a female retaining her previous partner
    const nestingbegin::Tuple{Int64,Int64} = (April, 10) # begin nesting in the middle of April
    const nestbuildingtime::UnitRange{Int64} = 4:5 # 4-5 days needed to build a nest (doubled for first nest)
    const eggsperclutch::UnitRange{Int64} = 2:5 # eggs laid per clutch
    const nestingend::Int64 = July # last month of nesting
end